Biology Circulation Online Mcqs Test

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Question 1

1. Which part of the cardiac cycle is responsible for the filling of the ventricles?

Answer

Ventricular diastole

Answer

Atrial diastole

Answer

Atrial systole

Answer

Ventricular systole

Question 2

2. The structure responsible for initiating the heartbeat is:

Answer

Bundle of His

Answer

Vagus nerve

Question 3

3. Which blood vessel returns blood from the upper body to the heart?

Answer

Superior vena cava

Answer

Inferior vena cava

Answer

Pulmonary vein

Question 4

4. Which of these is the main component of lymph?

Answer

Red blood cells

Answer

Water and proteins

Answer

White blood cells

Question 5

5. The process of moving lymph through lymph vessels is mainly aided by:

Answer

Muscle contraction

Answer

Arterial pressure

Question 6

6. Which side of the heart handles oxygen-rich blood?

Answer

Both sides

Answer

Right side

Question 7

7. Which part of the nervous system regulates heart rate?

Answer

Autonomic nervous system

Answer

Somatic nervous system

Answer

Central nervous system

Answer

Peripheral nervous system

Question 8

8. Which organ is primarily responsible for producing lymphocytes?

Question 9

9. Which component of the heart separates the left and right sides?

Answer

Myocardium

Answer

Pericardium

Question 10

10. Which vessel in the lymphatic system collects lymph from the lower body?

Answer

Jugular vein

Answer

Subclavian artery

Answer

Thoracic duct

Answer

Right lymphatic duct

Question 11

11. What is the function of the lymph nodes?

Answer

Pump lymph

Answer

Transport oxygen

Answer

Store blood

Answer

Filter lymph and fight infection

Question 12

12. Where does blood go immediately after leaving the left ventricle?

Answer

Pulmonary artery

Answer

Left atrium

Question 13

13. What initiates the heartbeat in the human heart?

Answer

Bundle of His

Answer

Purkinje fibers

Question 14

14. The closing of which valves prevents backflow into the ventricles?

Answer

Atrioventricular valves

Answer

Pulmonary valves

Answer

Tricuspid valves

Answer

Semilunar valves

Question 15

15. Which blood vessel carries oxygen-rich blood from the lungs to the heart?

Answer

Pulmonary artery

Answer

Pulmonary vein

Question 16

16. Which blood vessel carries oxygenated blood under high pressure?

Answer

Capillaries

Answer

Lymph vessels

Question 17

17. Which blood vessel has the smallest diameter?

Question 18

18. Which type of blood vessel usually carries blood under low pressure?

Answer

Capillaries

Answer

Arterioles

Question 19

19. What occurs during diastole?

Answer

Valves close

Answer

Blood is expelled from the heart

Answer

Heart muscles contract

Answer

Heart muscles relax and chambers fill with blood

Question 20

20. Which vessels have valves to prevent backflow of blood?

Answer

Capillaries

Answer

Arterioles

Question 21

21. Arteries are characterized by:

Answer

Carrying blood toward the heart

Answer

Thin walls and valves

Answer

Slow blood flow

Answer

Thick muscular walls and high pressure

Question 22

22. What is the function of capillaries in tissues?

Answer

Exchange nutrients and gases

Answer

Store blood

Answer

Prevent infection

Answer

Maintain blood pressure

Question 23

23. Which structure ensures one-way flow of blood in the heart?

Answer

Myocardium

Question 24

24. Which component of blood is primarily involved in clotting?

Answer

Red blood cells

Answer

White blood cells

Question 25

25. Which part of the heart pumps oxygenated blood to the entire body?

Answer

Left atrium

Answer

Left ventricle

Answer

Right atrium

Answer

Right ventricle

Question 26

26. Which part of the heart receives blood from the vena cava?

Answer

Left atrium

Answer

Left ventricle

Answer

Right atrium

Answer

Right ventricle

Question 27

27. Which blood vessels allow exchange of gases, nutrients, and waste?

Answer

Capillaries

Answer

Arterioles

Question 28

28. What does the lymphatic system transport from the small intestine?

Answer

Amino acids

Question 29

29. Which lymphatic organ is involved in the maturation of T-cells?

Answer

Bone marrow

Question 30

30. Which lymphatic organ is located in the upper left abdomen and stores white blood cells?

Question 31

31. Which type of circulation moves blood between the heart and lungs?

Answer

Pulmonary circulation

Answer

Hepatic circulation

Answer

Systemic circulation

Answer

Coronary circulation

Question 32

32. Which of the following is NOT a function of the lymphatic system?

Answer

Absorption of fats

Answer

Drainage of tissue fluid

Answer

Transportation of oxygen

Question 33

33. Which component conducts electrical impulses from atria to ventricles?

Answer

Purkinje fibers

Answer

Aortic valve

Question 34

34. Which part of the heart receives blood from the lungs?

Answer

Left ventricle

Answer

Right atrium

Answer

Right ventricle

Answer

Left atrium

Question 35

35. Which of the following arteries supplies blood to the heart muscle?

Answer

Coronary artery

Answer

Carotid artery

Answer

Renal artery

Answer

Pulmonary artery

Question 36

36. What is the average duration of the cardiac cycle?

Answer

1.0 second

Answer

0.8 second

Answer

0.2 seconds

Answer

2.0 seconds

Question 37

37. Which chamber of the heart pumps blood into the pulmonary circulation?

Answer

Left atrium

Answer

Left ventricle

Answer

Right atrium

Answer

Right ventricle

Question 38

38. What is the main function of red blood cells?

Answer

Blood clotting

Answer

Defense against infection

Answer

Hormone transport

Answer

Oxygen transport

Question 39

39. Which valve is located between the left atrium and left ventricle?

Answer

Aortic valve

Answer

Pulmonary valve

Answer

Bicuspid (mitral) valve

Answer

Tricuspid valve

Question 40

40. Where are lymph nodes most commonly found?

Answer

Under the skin

Answer

In the heart

Answer

Inside bones

Answer

Along large blood vessels

Question 41

41. What type of blood do pulmonary arteries carry?

Answer

Oxygenated

Answer

Deoxygenated

Question 42

42. Which phase of the cardiac cycle involves contraction of the ventricles?

Answer

Ventricular systole

Answer

Atrial systole

Answer

Atrial diastole

Answer

Ventricular diastole

Question 43

43. Which chamber of the human heart receives oxygen-poor blood from the body?

Answer

Right atrium

Answer

Right ventricle

Answer

Left atrium

Answer

Left ventricle

Question 44

44. Which valve prevents the backflow of blood from the right ventricle to the right atrium?

Answer

Bicuspid valve

Answer

Aortic valve

Answer

Tricuspid valve

Answer

Pulmonary valve

Question 45

45. What causes lymph to move in the body?

Answer

Muscle movement and valve action

Answer

High lymph pressure

Answer

Pumping of lymph nodes

Question 46

46. Which of the following returns lymph to the bloodstream?

Answer

Thoracic duct

Answer

Renal vein

Question 47

47. Which side of the heart receives blood from the body?

Answer

Right side

Answer

Both sides

Question 48

48. Which layer of the heart contains cardiac muscle?

Answer

Pericardium

Answer

Myocardium

Answer

Endocardium

Answer

Epicardium

Question 49

49. What causes the “lub-dub” sound of the heartbeat?

Answer

Opening of heart valves

Answer

Closing of heart valves

Answer

Blood entering the atria

Answer

Contraction of heart muscles

Question 50

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Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Biology Circulation Online Mcqs Test

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Important Biology Circulation Question and Answer

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