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. What occurs during diastole?

Valves close

Blood is expelled from the heart

Heart muscles relax and chambers fill with blood

Heart muscles contract

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

Heartbeat

Muscle contraction

Arterial pressure

Gravity

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

Pancreas

Liver

Kidney

Spleen

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

Left ventricle

Right atrium

Right ventricle

Left atrium

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

Left atrium

Right atrium

Right ventricle

Left ventricle

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

Left side

Right side

Both sides

Neither

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

Right atrium

Right ventricle

Left ventricle

Left atrium

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

1.0 second

0.8 second

0.2 seconds

2.0 seconds

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

Atrial systole

Ventricular systole

Ventricular diastole

Atrial diastole

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

Red blood cells

White blood cells

Plasma

Platelets

11. What is the function of capillaries in tissues?

Exchange nutrients and gases

Maintain blood pressure

Prevent infection

Store blood

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

Carotid artery

Coronary artery

Pulmonary artery

Renal artery

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

Bicuspid valve

Pulmonary valve

Tricuspid valve

Aortic valve

14. What is the function of the lymph nodes?

Pump lymph

Transport oxygen

Store blood

Filter lymph and fight infection

15. What initiates the heartbeat in the human heart?

SA node

Bundle of His

AV node

Purkinje fibers

16. Arteries are characterized by:

Thick muscular walls and high pressure

Carrying blood toward the heart

Thin walls and valves

Slow blood flow

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

Pulmonary artery

Aorta

Left atrium

Vena cava

18. Which organ is primarily responsible for producing lymphocytes?

Pancreas

Kidney

Liver

Spleen

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

Arterioles

Veins

Capillaries

Arteries

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

Atrial diastole

Atrial systole

Ventricular diastole

Ventricular systole

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

Hepatic circulation

Pulmonary circulation

Coronary circulation

Systemic circulation

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

Opening of heart valves

Blood entering the atria

Contraction of heart muscles

Closing of heart valves

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

Right ventricle

Left ventricle

Left atrium

Right atrium

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

Transportation of oxygen

Absorption of fats

Drainage of tissue fluid

Immunity

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

Arteries

Veins

Capillaries

Arterioles

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

AV node

SA node

Aortic valve

Purkinje fibers

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

Glucose

Amino acids

Fats

Water

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

Hormone transport

Oxygen transport

Blood clotting

Defense against infection

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

Veins

Arteries

Capillaries

Arterioles

30. The structure responsible for initiating the heartbeat is:

Bundle of His

Vagus nerve

AV node

SA node

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

Tricuspid valve

Pulmonary valve

Bicuspid (mitral) valve

Aortic valve

32. What causes lymph to move in the body?

Muscle movement and valve action

High lymph pressure

Pumping of lymph nodes

Gravity

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

Pulmonary valves

Tricuspid valves

Semilunar valves

Atrioventricular valves

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

Arteries

Septum

Valves

Myocardium

35. What type of blood do pulmonary arteries carry?

Deoxygenated

Filtered

Oxygenated

Mixed

36. Where are lymph nodes most commonly found?

Under the skin

In the heart

Along large blood vessels

Inside bones

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

Pulmonary artery

Pulmonary vein

Vena cava

Aorta

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

Thoracic duct

Renal vein

Capillary

Aorta

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

Pulmonary vein

Inferior vena cava

Superior vena cava

Aorta

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

White blood cells

Plasma

Red blood cells

Water and proteins

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

Jugular vein

Thoracic duct

Right lymphatic duct

Subclavian artery

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

Myocardium

Valve

Pericardium

Septum

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

Lymph vessels

Capillaries

Arteries

Veins

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

Right side

Left side

Both sides

Neither

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

Right ventricle

Left atrium

Right atrium

Left ventricle

46. Which layer of the heart contains cardiac muscle?

Pericardium

Myocardium

Endocardium

Epicardium

47. Which blood vessel has the smallest diameter?

Vein

Artery

Capillary

Venule

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

Thymus

Spleen

Bone marrow

Liver

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

Central nervous system

Peripheral nervous system

Somatic nervous system

Autonomic nervous system

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Mustansar KhanLast Updated: October 14, 2025

Important Biology Circulation Question and Answer

Biology Circulation Practice Test Online With Explanation

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