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Biology Circulation Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Biology Circulation Question and Answer

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Biology Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Biology Interview Question Answer Universities Entrance Test

Biology Circulation Practice Test Online With Explanation

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

Absorption of fats

Immunity

Drainage of tissue fluid

Transportation of oxygen

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

Capillaries

Veins

Arteries

Arterioles

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

Thoracic duct

Capillary

Aorta

Renal vein

4. What is the function of the lymph nodes?

Store blood

Filter lymph and fight infection

Pump lymph

Transport oxygen

5. What causes lymph to move in the body?

Muscle movement and valve action

Pumping of lymph nodes

High lymph pressure

Gravity

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

Right ventricle

Left ventricle

Right atrium

Left atrium

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

Red blood cells

Plasma

White blood cells

Platelets

8. Which blood vessel has the smallest diameter?

Vein

Capillary

Artery

Venule

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

Bicuspid valve

Tricuspid valve

Aortic valve

Pulmonary valve

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

Coronary artery

Pulmonary artery

Renal artery

Carotid artery

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

Left atrium

Left ventricle

Right atrium

Right ventricle

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

Ventricular diastole

Atrial systole

Ventricular systole

Atrial diastole

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

Pulmonary valve

Bicuspid (mitral) valve

Tricuspid valve

Aortic valve

14. What is the function of capillaries in tissues?

Maintain blood pressure

Store blood

Exchange nutrients and gases

Prevent infection

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

Systemic circulation

Hepatic circulation

Pulmonary circulation

Coronary circulation

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

Veins

Capillaries

Arteries

Lymph vessels

17. The structure responsible for initiating the heartbeat is:

AV node

SA node

Vagus nerve

Bundle of His

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

Hormone transport

Blood clotting

Oxygen transport

Defense against infection

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

Valve

Septum

Pericardium

Myocardium

20. Arteries are characterized by:

Thick muscular walls and high pressure

Thin walls and valves

Slow blood flow

Carrying blood toward the heart

21. Which layer of the heart contains cardiac muscle?

Epicardium

Myocardium

Endocardium

Pericardium

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

Left ventricle

Left atrium

Right atrium

Right ventricle

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

SA node

AV node

Purkinje fibers

Aortic valve

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

Right atrium

Left ventricle

Left atrium

Right ventricle

25. What initiates the heartbeat in the human heart?

Purkinje fibers

SA node

Bundle of His

AV node

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

Right atrium

Left atrium

Left ventricle

Right ventricle

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

Atrioventricular valves

Pulmonary valves

Tricuspid valves

Semilunar valves

28. Which organ is primarily responsible for producing lymphocytes?

Kidney

Pancreas

Liver

Spleen

29. What type of blood do pulmonary arteries carry?

Deoxygenated

Oxygenated

Mixed

Filtered

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

Glucose

Fats

Amino acids

Water

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

Bone marrow

Spleen

Liver

Thymus

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

Arteries

Arterioles

Veins

Capillaries

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

Thoracic duct

Right lymphatic duct

Jugular vein

Subclavian artery

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

Vena cava

Pulmonary artery

Left atrium

Aorta

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

Veins

Arteries

Arterioles

Capillaries

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

Opening of heart valves

Contraction of heart muscles

Blood entering the atria

Closing of heart valves

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

Ventricular diastole

Ventricular systole

Atrial diastole

Atrial systole

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

Left side

Both sides

Right side

Neither

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

0.8 second

0.2 seconds

1.0 second

2.0 seconds

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

Central nervous system

Autonomic nervous system

Peripheral nervous system

Somatic nervous system

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

Aorta

Pulmonary artery

Vena cava

Pulmonary vein

42. Where are lymph nodes most commonly found?

Under the skin

Along large blood vessels

In the heart

Inside bones

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

Pulmonary vein

Aorta

Inferior vena cava

Superior vena cava

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

Arteries

Valves

Septum

Myocardium

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

Heartbeat

Gravity

Muscle contraction

Arterial pressure

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

Red blood cells

Plasma

White blood cells

Water and proteins

47. What occurs during diastole?

Valves close

Heart muscles relax and chambers fill with blood

Heart muscles contract

Blood is expelled from the heart

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

Pancreas

Spleen

Liver

Kidney

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

Right side

Left side

Neither

Both sides

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Mustansar KhanLast Updated: October 14, 2025

Biology Circulation Online Mcqs Test

Important Biology Circulation Question and Answer

Biology Circulation Practice Test Online With Explanation

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