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 is the average duration of the cardiac cycle?

1.0 second

2.0 seconds

0.8 second

0.2 seconds

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

Pulmonary artery

Vena cava

Aorta

Pulmonary vein

3. What is the function of capillaries in tissues?

Prevent infection

Store blood

Maintain blood pressure

Exchange nutrients and gases

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

Red blood cells

Plasma

Platelets

White blood cells

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

Myocardium

Arteries

Septum

Valves

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

Septum

Myocardium

Pericardium

Valve

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

Spleen

Liver

Pancreas

Kidney

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

Contraction of heart muscles

Blood entering the atria

Opening of heart valves

Closing of heart valves

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

Thymus

Spleen

Bone marrow

Liver

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

Vena cava

Pulmonary artery

Aorta

Left atrium

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

Subclavian artery

Jugular vein

Right lymphatic duct

Thoracic duct

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

Left atrium

Left ventricle

Right atrium

Right ventricle

13. Which blood vessel has the smallest diameter?

Vein

Capillary

Artery

Venule

14. Which layer of the heart contains cardiac muscle?

Endocardium

Myocardium

Epicardium

Pericardium

15. What type of blood do pulmonary arteries carry?

Filtered

Mixed

Oxygenated

Deoxygenated

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

Right ventricle

Left ventricle

Left atrium

Right atrium

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

Defense against infection

Blood clotting

Hormone transport

Oxygen transport

18. The structure responsible for initiating the heartbeat is:

SA node

Bundle of His

Vagus nerve

AV node

19. Which organ is primarily responsible for producing lymphocytes?

Liver

Kidney

Pancreas

Spleen

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

Purkinje fibers

SA node

Aortic valve

AV node

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

Veins

Arterioles

Capillaries

Arteries

22. Arteries are characterized by:

Slow blood flow

Carrying blood toward the heart

Thin walls and valves

Thick muscular walls and high pressure

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

Renal vein

Thoracic duct

Capillary

Aorta

24. What is the function of the lymph nodes?

Filter lymph and fight infection

Transport oxygen

Store blood

Pump lymph

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

Carotid artery

Renal artery

Coronary artery

Pulmonary artery

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

Veins

Arteries

Capillaries

Lymph vessels

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

Atrial diastole

Atrial systole

Ventricular diastole

Ventricular systole

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

Veins

Capillaries

Arterioles

Arteries

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

Muscle contraction

Arterial pressure

Heartbeat

Gravity

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

Peripheral nervous system

Autonomic nervous system

Central nervous system

Somatic nervous system

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

Plasma

Water and proteins

Red blood cells

White blood cells

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

Coronary circulation

Pulmonary circulation

Hepatic circulation

Systemic circulation

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

Neither

Both sides

Right side

Left side

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

Bicuspid valve

Aortic valve

Pulmonary valve

Tricuspid valve

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

Right atrium

Left atrium

Left ventricle

Right ventricle

36. What initiates the heartbeat in the human heart?

AV node

SA node

Bundle of His

Purkinje fibers

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

Capillaries

Arteries

Arterioles

Veins

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

Left atrium

Right ventricle

Right atrium

Left ventricle

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

Superior vena cava

Inferior vena cava

Pulmonary vein

Aorta

40. What causes lymph to move in the body?

High lymph pressure

Pumping of lymph nodes

Muscle movement and valve action

Gravity

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

Amino acids

Glucose

Water

Fats

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

Ventricular diastole

Atrial systole

Ventricular systole

Atrial diastole

43. Where are lymph nodes most commonly found?

Under the skin

Inside bones

Along large blood vessels

In the heart

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

Right side

Left side

Both sides

Neither

45. What occurs during diastole?

Blood is expelled from the heart

Heart muscles relax and chambers fill with blood

Valves close

Heart muscles contract

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

Right atrium

Left ventricle

Left atrium

Right ventricle

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

Aortic valve

Pulmonary valve

Tricuspid valve

Bicuspid (mitral) valve

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

Transportation of oxygen

Drainage of tissue fluid

Absorption of fats

Immunity

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

Atrioventricular valves

Pulmonary valves

Semilunar valves

Tricuspid valves

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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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