1. The function of platelets is:
a) Oxygen transport
b) Blood clotting
c) Immune response
d) Nutrient transport
Answer: b) Blood clotting
2. The correct sequence of types of WBCs in decreasing order in terms of number per mm³ of human blood?
a) Eosinophil > Basophil > Neutrophil
b) Basophil > Eosinophil > Neutrophil
c) Eosinophil > Neutrophil > Basophil
d) Neutrophil > Eosinophil > Basophil
Answer: d) Neutrophil > Eosinophil > Basophil
3. The largest amount of urea is carried in humans by:
a) Renal vein
b) Renal artery
c) Hepatic vein
d) Hepatic portal vein
Answer: c) Hepatic vein
4. The heart’s ability to contract without external nervous stimulation is due to:
a) The presence of the SA node
b) The Purkinje fibers
c) The AV node
d) The cardiac muscle cells
Answer: d) The cardiac muscle cells
5. The maximum surface area of our circulatory system is present in:
a) Capillaries
b) Arteries
c) Veins
d) Heart
Answer: a) Capillaries
6. The condition where there is a deficiency of RBCs is known as:
a) Leukemia
b) Hemophilia
c) Anemia
d) Polycythemia
Answer: c) Anemia
7. The heart of a cockroach is:
a) 13-chambered
b) 9-chambered
c) 12-chambered
d) 3-chambered
Answer: a) 13-chambered
8. The cardiac output is regulated by:
a) The parasympathetic nervous system alone
b) The sympathetic nervous system alone
c) Both the sympathetic and parasympathetic nervous systems
d) The autonomic nervous system
Answer: c) Both the sympathetic and parasympathetic nervous systems
9. The function of valves in veins is to:
a) Prevent backflow of blood
b) Facilitate oxygen exchange
c) Increase blood pressure
d) Regulate heart rate
Answer: a) Prevent backflow of blood
10. The "Lub" sound produced during a heartbeat is caused by:
a) Atrial systole
b) Atrial diastole
c) Ventricular systole
d) Ventricular diastole
Answer: c) Ventricular systole
11. An artificial pacemaker is implanted in an individual due to a defect in:
a) AV node
b) SA node
c) SV node
d) Purkinje fibers
Answer: b) SA node
12. The cardiac impulse originates from:
a) AV node
b) SA node
c) Brain
d) AV bundle
Answer: b) SA node
13. The deposition of lipids on the wall lining the lumen of large and medium-sized arteries is referred to as:
a) Thrombosis
b) Osteoporosis
c) Angina pectoris
d) Atherosclerosis
Answer: d) Atherosclerosis
14. The heart of a cockroach is:
a) 13-chambered
b) 9-chambered
c) 12-chambered
d) 3-chambered
Answer: a) 13-chambered
15. The highest amount of CO₂ is carried through:
a) Pulmonary vein
b) Coronary artery
c) Aorta
d) Pulmonary artery
Answer: d) Pulmonary artery
16. The heart’s ability to contract without external nervous stimulation is due to:
a) The presence of the SA node
b) The Purkinje fibers
c) The AV node
d) The cardiac muscle cells
Answer: d) The cardiac muscle cells
17. The function of valves in veins is to:
a) Prevent backflow of blood
b) Facilitate oxygen exchange
c) Increase blood pressure
d) Regulate heart rate
Answer: a) Prevent backflow of blood
18. The lifespan of mammalian RBCs is:
a) Two months
b) Three months
c) Four months
d) 10 to 13 days
Answer: c) Four months
19. An Rh⁻ person donated blood to an Rh⁺ person for the second time. Then:
a) Rh⁺ person will die
b) Rh⁺ person will suffer from anemia
c) Rh⁺ person will develop agglutination
d) Rh⁺ person will not suffer from any effects
Answer: c) Rh⁺ person will develop agglutination
20. Incomplete double circulation is present in:
a) Fish and amphibian
b) Amphibia and Reptilia
c) Reptilian and birds
d) Reptilian and fish
Answer: b) Amphibia and Reptilia
21. The main function of the lymphatic system is:
a) Oxygen transport
b) Nutrient transport
c) Immune response
d) Blood clotting
Answer: c) Immune response
22. The principal function of the lymphatic system is:
a) Production of RBCs
b) Digestion
c) Transport of lymph
d) Oxygen transport
Answer: c) Transport of lymph
23. The structure that ensures one-way flow of blood from the left ventricle to the aorta is the:
a) Tricuspid valve
b) Bicuspid valve
c) Semilunar valve
d) AV valve
Answer: c) Semilunar valve
24. The condition where there is a deficiency of RBCs is known as:
a) Leukemia
b) Hemophilia
c) Anemia
d) Polycythemia
Answer: c) Anemia
25. The term used for the red blood cell count is:
a) Erythropoiesis
b) Erythrocytosis
c) Erythrocyte
d) Erythrocytemia
Answer: b) Erythrocytosis
26. The "Lub" sound produced during a heartbeat is caused by:
a) Atrial systole
b) Atrial diastole
c) Ventricular systole
d) Ventricular diastole
Answer: c) Ventricular systole
27. The principal function of the lymphatic system is:
a) Production of RBCs
b) Digestion
c) Transport of lymph
d) Oxygen transport
Answer: c) Transport of lymph
28. The condition characterized by the hardening of the arterial walls is:
a) Atherosclerosis
b) Arteriosclerosis
c) Hypertension
d) Thrombosis
Answer: b) Arteriosclerosis
29. The function of the lymphatic system includes:
a) Transport of gases
b) Immune surveillance
c) Nutrient absorption
d) Blood clotting
Answer: b) Immune surveillance
30. Which of the following is not a part of systemic circulation?
a) Pulmonary artery
b) Aorta
c) Renal artery
d) Superior vena cava
Answer: a) Pulmonary artery
31. The heart is enclosed within a protective sac called:
a) Pericardium
b) Endocardium
c) Myocardium
d) Epicardium
Answer: a) Pericardium
32. The cardiac impulse originates from:
a) AV node
b) SA node
c) Brain
d) AV bundle
Answer: b) SA node
33. The condition in which the heart fails to pump blood effectively is:
a) Myocarditis
b) Heart failure
c) Arrhythmia
d) Tachycardia
Answer: b) Heart failure
34. The valve situated between the right atrium and the right ventricle is called:
a) Bicuspid valve
b) Tricuspid valve
c) Semilunar valve
d) Mitral valve
Answer: b) Tricuspid valve
35. Which structure ensures one-way flow of blood from the left ventricle to the aorta?
a) Tricuspid valve
b) Bicuspid valve
c) Semilunar valve
d) AV valve
Answer: c) Semilunar valve
36. The backflow of blood from the left ventricle to the right auricle is prevented by:
a) Tricuspid valve
b) Bicuspid valve
c) Semilunar valve
d) AV valve
Answer: b) Bicuspid valve
37. The condition where there is a deficiency of RBCs is known as:
a) Leukemia
b) Hemophilia
c) Anemia
d) Polycythemia
Answer: c) Anemia
38. The primary function of the circulatory system is:
a) Transport of nutrients
b) Regulation of temperature
c) Removal of waste
d) All of the above
Answer: d) All of the above
39. Which of the following is not a type of blood vessel?
a) Vein
b) Artery
c) Capillary
d) Nerve
Answer: d) Nerve
40. The substance that helps in the clotting of blood is:
a) Hemoglobin
b) Platelets
c) Plasma
d) White blood cells
Answer: b) Platelets
41. The heart’s ability to contract without external nervous stimulation is due to:
a) The presence of the SA node
b) The Purkinje fibers
c) The AV node
d) The cardiac muscle cells
Answer: d) The cardiac muscle cells
42. The vein carrying oxygenated blood from the lungs to the left atrium is:
a) Pulmonary vein
b) Jugular vein
c) Coronary vein
d) Renal vein
Answer: a) Pulmonary vein
43. The “Lub” sound produced during a heartbeat is caused by:
a) Atrial systole
b) Atrial diastole
c) Ventricular systole
d) Ventricular diastole
Answer: c) Ventricular systole
44. The primary function of the circulatory system is:
a) Transport of nutrients
b) Regulation of temperature
c) Removal of waste
d) All of the above
Answer: d) All of the above
45. The cardiac output is:
a) The amount of blood pumped by the heart per beat
b) The amount of blood pumped by the heart per minute
c) The amount of blood in the heart at the end of diastole
d) The pressure exerted by the blood on the walls of the arteries
Answer: b) The amount of blood pumped by the heart per minute
46. The largest chamber of the human heart is:
a) Left atrium
b) Right atrium
c) Left ventricle
d) Right ventricle
Answer: c) Left ventricle
47. The "Lub" sound produced during a heartbeat is caused by:
a) Atrial systole
b) Atrial diastole
c) Ventricular systole
d) Ventricular diastole
Answer: c) Ventricular systole
48. The primary component of blood plasma is:
a) Proteins
b) Water
c) Cells
d) Hormones
Answer: b) Water
49. The smallest blood vessels in the body are:
a) Arteries
b) Veins
c) Capillaries
d) Venules
Answer: c) Capillaries
50. The structure that separates the right and left sides of the heart is the:
a) Interventricular septum
b) Interatrial septum
c) Pericardium
d) Endocardium
Answer: a) Interventricular septum
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