BODY FLUIDS AND CIRCULATION 100 BEST MCQS.

BODY FLUIDS AND CIRCULATION 100 BEST MCQS | FOR NEET EXAMINATION | NEET MOCK TEST

 

BODY FLUIDS AND CIRCULATION:

here are 100 multiple-choice questions on the topic of body fluids and circulation along with their answers and explanations:

1. Which of the following is NOT a component of blood?
A) Plasma
B) Red blood cells
C) White blood cells
D) Enzymes
*Answer: D) Enzymes*
Explanation: Enzymes are not a component of blood; they are proteins that facilitate biochemical reactions.

2. Which blood vessels carry blood away from the heart?
A) Arteries
B) Veins
C) Capillaries
D) Venules
*Answer: A) Arteries*
Explanation: Arteries carry oxygen-rich blood away from the heart to the body tissues.

3. The liquid portion of blood is known as:
A) Plasma
B) Serum
C) Lymph
D) Interstitial fluid
*Answer: A) Plasma*
Explanation: Plasma is the liquid portion of blood, composed mainly of water, electrolytes, and proteins.

4. Which of the following is NOT a function of blood?
A) Transport of nutrients
B) Regulation of body temperature
C) Production of bile
D) Defence against pathogens
*Answer: C) Production of bile*
Explanation: Blood does not produce bile; that is a function of the liver.

5. What is the function of haemoglobin in red blood cells?
A) Transport of oxygen
B) Defence against pathogens
C) Blood clotting
D) Regulation of blood pressure
*Answer: A) Transport of oxygen*
Explanation: Haemoglobin binds with oxygen in the lungs and carries it to the body tissues.

6. Which blood vessel has the smallest diameter?
A) Artery
B) Vein
C) Capillary
D) Venule
*Answer: C) Capillary*
Explanation: Capillaries have the smallest diameter among blood vessels, facilitating the exchange of gases, nutrients, and wastes between blood and tissues.

7. Which of the following is responsible for the clotting of blood?
A) Platelets
B) Red blood cells
C) White blood cells
D) Plasma
*Answer: A) Platelets*
Explanation: Platelets are cell fragments that play a crucial role in blood clotting by forming a plug at the site of injury.

8. Which chamber of the heart pumps oxygenated blood to the body?
A) Left atrium
B) Left ventricle
C) Right atrium
D) Right ventricle
*Answer: B) Left ventricle*
Explanation: The left ventricle pumps oxygenated blood to the body through the systemic circulation.

9. The double-layered sac surrounding the heart is called the:
A) Pericardium
B) Myocardium
C) Endocardium
D) Epicardium
*Answer: A) Pericardium*
Explanation: The pericardium is a protective sac surrounding the heart, composed of two layers: the fibrous pericardium and the serous pericardium.

10. Blood pressure is highest in which blood vessel?
A) Artery
B) Vein
C) Capillary
D) Venule
*Answer: A) Artery*
Explanation: Blood pressure is highest in arteries as they receive blood pumped directly from the heart.

11. The pacemaker of the heart is located in the:
A) Atrioventricular node (AV node)
B) Bundle of His
C) Sinoatrial node (SA node)
D) Purkinje fibres
*Answer: C) Sinoatrial node (SA node)*
Explanation: The SA node is the natural pacemaker of the heart, initiating the electrical impulses responsible for heart contractions.

12. What is the average lifespan of a red blood cell?
A) 60 days
B) 90 days
C) 120 days
D) 180 days
*Answer: C) 120 days*
Explanation: Red blood cells typically have a lifespan of around 120 days before being removed by the spleen and liver.

13. The fluid that leaks out of capillaries and bathes the body’s tissues is called:
A) Plasma
B) Lymph
C) Interstitial fluid
D) Serum
*Answer: C) Interstitial fluid*
Explanation: Interstitial fluid is the fluid that surrounds cells in tissues, providing them with nutrients and removing waste products.

14. Which of the following is NOT a component of the lymphatic system?
A) Lymph nodes
B) Lymphatic vessels
C) Lymphatic ducts
D) Trachea
*Answer: D) Trachea*
Explanation: The trachea is part of the respiratory system, not the lymphatic system.

15. Which blood type is known as the universal donor?
A) A
B) B
C) AB
D) O
*Answer: D) O*
Explanation: Blood type O is considered the universal donor because it lacks A and B antigens, minimizing the risk of immune reactions.

16. Which of the following is NOT a function of the lymphatic system?
A) Absorption of fats
B) Removal of interstitial fluid
C) Production of red blood cells
D) Immune defence
*Answer: C) Production of red blood cells*
Explanation: The lymphatic system does not produce red blood cells; that is the function of the bone marrow.

17. Blood is filtered and urine is produced in which structure of the kidney?
A) Renal cortex
B) Renal medulla
C) Renal pelvis
D) Nephron
*Answer: D) Nephron*
Explanation: Nephrons are the functional units of the kidney where blood is filtered and urine is produced.

18. Which hormone regulates the concentration of sodium and potassium ions in the blood?
A) Insulin
B) Glucagon
C) Aldosterone
D) Thyroxine
*Answer: C) Aldosterone*
Explanation: Aldosterone, produced by the adrenal glands, regulates the balance of sodium and potassium ions in the blood.

19. Which of the following statements about blood vessels is TRUE?
A) Veins carry blood away from the heart.
B) Arteries have valves to prevent backflow of blood.
C) Capillaries have thick walls to withstand high pressure.
D) Venules connect arteries to capillaries.
*Answer: B) Arteries have valves to prevent backflow of blood.*
Explanation: Arteries have valves to prevent the backflow of blood, ensuring that blood flows in one direction only.

20. Which of the following is NOT a major component of blood plasma?
A) Water
B) Electrolytes
C) Red blood cells
D) Proteins
*Answer: C) Red blood cells*

Explanation: Red blood cells are cellular components of blood and are not found in blood plasma.

21. The exchange of gases between blood and body tissues occurs in:
A) Arteries
B) Veins
C) Capillaries
D) Venules
*Answer: C) Capillaries*
Explanation: Capillaries are thin-walled vessels where the exchange of gases, nutrients, and wastes occurs between blood and tissues.

22. What is the role of the lymphatic system in immunity?
A) It produces antibodies.
B) It filters blood.
C) It removes pathogens from the body.
D) It transports lymphocytes and antibodies.
*Answer: D) It transports lymphocytes and antibodies.*
Explanation: The lymphatic system transports lymphocytes (white blood cells) and antibodies throughout the body, aiding in immune responses.

23. The process by which white blood cells engulf and destroy pathogens is called:
A) Phagocytosis
B) Pinocytosis
C) Exocytosis
D) Osmosis
*Answer: A) Phagocytosis*
Explanation: Phagocytosis is the process by which white blood cells engulf and destroy pathogens or foreign particles.

24. Which of the following is NOT a type of white blood cell?
A) Neutrophil
B) Basophil
C) Monocyte
D) Thrombocyte
*Answer: D) Thrombocyte*
Explanation: Thrombocytes, or platelets, are cell fragments involved in blood clotting, not white blood cells.

25. Which blood vessel carries deoxygenated blood from the body to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Inferior vena cava
*Answer: D) Inferior vena cava*
Explanation: The inferior vena cava carries deoxygenated blood from the body to the right atrium of the heart.

26. What causes blood pressure?
A) Contraction of the heart
B) Relaxation of the heart
C) Constriction of blood vessels
D) Expansion of blood vessels
*Answer: A) Contraction of the heart*
Explanation: Blood pressure is primarily generated by the force of the heart’s contractions as it pumps blood into the arteries.

27. The innermost layer of an artery or vein is called the:
A) Tunica externa
B) Tunica media
C) Tunica intima
D) Endothelium
*Answer: C) Tunica intima*
Explanation: The tunica intima is the innermost layer of blood vessels, composed of endothelial cells.

28. Which of the following hormones is NOT produced by the adrenal glands?
A) Adrenaline
B) Cortisol
C) Insulin
D) Aldosterone
*Answer: C) Insulin*
Explanation: Insulin is produced by the pancreas, not the adrenal glands.

29. What is the main function of the spleen?
A) Blood filtration
B) Red blood cell production
C) Nutrient absorption
D) Hormone secretion
*Answer: A) Blood filtration*
Explanation: The spleen filters blood, removing old or damaged red blood cells and pathogens.

30. Which of the following statements about blood clotting is TRUE?
A) Haemoglobin is essential for blood clotting.
B) Blood clotting is initiated by platelets.
C) Fibrinogen is converted into fibrin during blood clotting.
D) Blood clotting prevents the formation of scabs.
*Answer: C) Fibrinogen is converted into fibrin during blood clotting.*
Explanation: Fibrinogen, a soluble plasma protein, is converted into fibrin, which forms the meshwork of a blood clot.

31. Which of the following is NOT a type of blood vessel?
A) Artery
B) Vein
C) Lymphatic duct
D) Nerve
*Answer: D) Nerve*
Explanation: Nerve is not a type of blood vessel; it is a part of the nervous system.

32. The process by which red blood cells are formed is called:
A) Haemostasis
B) Homolysis
C) Haematopoiesis
D) Haemoglobinization
*Answer: C) Haematopoiesis*
Explanation: Haematopoiesis is the process by which red blood cells, white blood cells, and platelets are formed in the bone marrow.

33. Blood pH is maintained within a narrow range mainly by:
A) Red blood cells
B) White blood cells
C) Platelets
D) Buffers in plasma
*Answer: D) Buffers in plasma*
Explanation: Buffers in plasma, such as bicarbonate ions, help maintain blood pH within a narrow range.

34. The coronary arteries supply blood to which organ?
A) Brain
B) Heart
C) Liver
D) Lungs
*Answer: B) Heart*
Explanation: The coronary arteries supply oxygenated blood to the heart muscle.

35. Which of the following statements about blood pressure is TRUE?
A) Diastolic pressure is the pressure exerted on blood vessel walls during ventricular contraction.
B) Systolic pressure is the lower number in a blood pressure reading.
C) Blood pressure is measured in millimetres of mercury (mmHg).
D) Normal blood pressure is below 140/90 mmHg.
*Answer: C) Blood pressure is measured in millimetres of mercury (mmHg).*
Explanation: Blood pressure is typically measured in millimetres of mercury (mmHg) and is represented by two numbers, systolic and diastolic pressure.

36. Which of the following is NOT a function of lymph nodes?
A) Production of lymphocytes
B) Filtration of lymph
C) Destruction of pathogens
D) Regulation of blood pressure
*Answer: D) Regulation of blood pressure*
Explanation: Lymph nodes are primarily involved in filtering lymph, producing lymphocytes, and destroying pathogens.

37. What is the role of the sinoatrial (SA) node in the heart?
A) It relays electrical impulses between atria and ventricles.
B) It coordinates heart contractions.
C) It initiates the heartbeat.
D) It regulates blood pressure.
*Answer: C) It initiates the heartbeat.*
Explanation: The SA node initiates the electrical impulses that stimulate heart contractions, establishing the heart’s rhythm.

38. Which of the following conditions results from insufficient red blood cells or haemoglobin?
A) Anaemia
B) Leukaemia
C) Haemophilia
D) Thrombocytopenia
*Answer: A) Anemia*
Explanation: Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin, leading to reduced oxygen-carrying capacity of the blood

.

39. The largest lymphatic organ in the body is the:
A) Thymus
B) Spleen
C) Lymph node
D) Tonsil
*Answer: B) Spleen*
Explanation: The spleen is the largest lymphatic organ, involved in filtering blood and removing old or damaged red blood cells.

40. Which of the following blood vessels carries oxygenated blood from the lungs to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Superior vena cava
*Answer: B) Pulmonary vein*
Explanation: The pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart.

41. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

42. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

43. What is the function of the thymus gland?
A) Production of insulin
B) Production of hormones that regulate metabolism
C) Production of T lymphocytes
D) Production of bile
*Answer: C) Production of T lymphocytes*
Explanation: The thymus gland is involved in the production and maturation of T lymphocytes, a type of white blood cell important for immune responses.

44. Which of the following conditions is characterized by high blood pressure?
A) Hypertension
B) Hypotension
C) Bradycardia
D) Tachycardia
*Answer: A) Hypertension*
Explanation: Hypertension is a medical condition characterized by persistently high blood pressure.

45. Which of the following is NOT a component of the cardiovascular system?
A) Heart
B) Blood vessels
C) Lungs
D) Liver
*Answer: D) Liver*
Explanation: The liver is not a component of the cardiovascular system; it is part of the digestive system.

46. What is the primary function of the valves in the heart?
A) To regulate blood pressure
B) To prevent backflow of blood
C) To produce red blood cells
D) To facilitate gas exchange
*Answer: B) To prevent backflow of blood*
Explanation: Valves in the heart prevent the backflow of blood, ensuring that blood flows in one direction through the heart chambers.

47. The process by which blood cells are formed is called:
A) Erythropoiesis
B) Thrombopoiesis
C) Leukopoiesis
D) Hemostasis
*Answer: A) Erythropoiesis*
Explanation: Erythropoiesis is the process by which red blood cells are formed in the bone marrow.

48. Which of the following is NOT a risk factor for cardiovascular disease?
A) High blood pressure
B) Obesity
C) Regular exercise
D) Smoking
*Answer: C) Regular exercise*
Explanation: Regular exercise is not a risk factor for cardiovascular disease; it is associated with a reduced risk.

49. The exchange of nutrients and wastes between blood and tissues occurs in which blood vessels?
A) Arteries
B) Veins
C) Capillaries
D) Venules
*Answer: C) Capillaries*
Explanation: Capillaries are thin-walled vessels where the exchange of nutrients and wastes occurs between blood and tissues.

50. Which of the following is NOT a type of white blood cell?
A) Neutrophil
B) Basophil
C) Monocyte
D) Thrombocyte
*Answer: D) Thrombocyte*
Explanation: Thrombocytes, or platelets, are cell fragments involved in blood clotting, not white blood cells.

51. The process by which red blood cells are formed is called:
A) Hemostasis
B) Hemolysis
C) Hematopoiesis
D) Hemoglobinization
*Answer: C) Hematopoiesis*
Explanation: Hematopoiesis is the process by which red blood cells, white blood cells, and platelets are formed in the bone marrow.

52. Blood pH is maintained within a narrow range mainly by:
A) Red blood cells
B) White blood cells
C) Platelets
D) Buffers in plasma
*Answer: D) Buffers in plasma*
Explanation: Buffers in plasma, such as bicarbonate ions, help maintain blood pH within a narrow range.

53. The coronary arteries supply blood to which organ?
A) Brain
B) Heart
C) Liver
D) Lungs
*Answer: B) Heart*
Explanation: The coronary arteries supply oxygenated blood to the heart muscle.

54. Which of the following statements about blood pressure is TRUE?
A) Diastolic pressure is the pressure exerted on blood vessel walls during ventricular contraction.
B) Systolic pressure is the lower number in a blood pressure reading.
C) Blood pressure is measured in millimeters of mercury (mmHg).
D) Normal blood pressure is below 140/90 mmHg.
*Answer: C) Blood pressure is measured in millimeters of mercury (mmHg).*
Explanation: Blood pressure is typically measured in millimeters of mercury (mmHg) and is represented by two numbers, systolic and diastolic pressure.

55. Which of the following is NOT a function of lymph nodes?
A) Production of lymphocytes
B) Filtration of lymph
C) Destruction of pathogens
D) Regulation of blood pressure
*Answer: D) Regulation of blood pressure*
Explanation: Lymph nodes are primarily involved in filtering lymph, producing lymphocytes, and destroying pathogens.

56. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

57. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
**Answer: A) To prevent the formation of blood clots**
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

58. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

59. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

60. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

61. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

62. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

63. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

64. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

65. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

66. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

67. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

68. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

69. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

70. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

71. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

72. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

73. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

74. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

75. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots

C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

76. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

77. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

78. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

79. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

80. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

81. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

82. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

83. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

84. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

85. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

86. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

87. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

88. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

89. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

90. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

91. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

92. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

93. What is the role of anticoagulants in blood clotting?

A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

94. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

95. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

96. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

97. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

98. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

99. What is the role of anticoagulants in blood clotting?
A) To prevent the formation of blood clots
B) To dissolve existing blood clots
C) To enhance platelet aggregation
D) To stimulate fibrinogen production
*Answer: A) To prevent the formation of blood clots*
Explanation: Anticoagulants inhibit blood clotting by preventing the formation of new clots.

100. Blood in the pulmonary arteries is:
A) Oxygenated
B) Deoxygenated
C) A mixture of oxygenated and deoxygenated
D) Not relevant to gas exchange
*Answer: B) Deoxygenated*
Explanation: The pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.

 

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