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MDCAT Biology Circulation Online Test

Mustansar KhanLast Updated: June 14, 2025

MDCAT Biology Circulation Test

MDCAT Biology Circulation Chaper 11 Online Test

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:	MDCAT Entry Test Biology Online Test Interview Questions about Biology All Universities Entrance Test Recruitments Tests

MDCAT Biology Circulation MCQS Online Test

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

Arterioles

Veins

Capillaries

Arteries

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

Ventricular systole

Ventricular diastole

Atrial diastole

Atrial systole

3. What type of blood do pulmonary arteries carry?

Deoxygenated

Oxygenated

Filtered

Mixed

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

Aortic valve

Bicuspid valve

Tricuspid valve

Pulmonary valve

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

Lymph vessels

Capillaries

Veins

Arteries

6. What is the function of the lymph nodes?

Store blood

Filter lymph and fight infection

Pump lymph

Transport oxygen

7. What is the function of capillaries in tissues?

Exchange nutrients and gases

Maintain blood pressure

Prevent infection

Store blood

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

Left ventricle

Right atrium

Right ventricle

Left atrium

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

Left ventricle

Right ventricle

Left atrium

Right atrium

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

White blood cells

Plasma

Water and proteins

Red blood cells

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

Pulmonary valve

Bicuspid (mitral) valve

Aortic valve

Tricuspid valve

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

Thoracic duct

Aorta

Capillary

Renal vein

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

Arteries

Capillaries

Veins

Arterioles

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

Defense against infection

Oxygen transport

Blood clotting

Hormone transport

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

Right ventricle

Left atrium

Right atrium

Left ventricle

16. Which layer of the heart contains cardiac muscle?

Pericardium

Epicardium

Endocardium

Myocardium

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

SA node

Purkinje fibers

Aortic valve

AV node

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

White blood cells

Plasma

Red blood cells

Platelets

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

Right side

Neither

Both sides

Left side

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

Ventricular systole

Atrial diastole

Atrial systole

Ventricular diastole

21. What initiates the heartbeat in the human heart?

SA node

Bundle of His

Purkinje fibers

AV node

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

Pulmonary circulation

Coronary circulation

Systemic circulation

Hepatic circulation

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

Contraction of heart muscles

Opening of heart valves

Blood entering the atria

Closing of heart valves

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

Left atrium

Left ventricle

Right ventricle

Right atrium

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

Left atrium

Pulmonary artery

Vena cava

Aorta

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

Myocardium

Septum

Valves

Arteries

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

Water

Fats

Glucose

Amino acids

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

0.8 second

2.0 seconds

1.0 second

0.2 seconds

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

Atrioventricular valves

Semilunar valves

Pulmonary valves

Tricuspid valves

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

Kidney

Spleen

Pancreas

Liver

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

Thoracic duct

Subclavian artery

Jugular vein

Right lymphatic duct

32. What occurs during diastole?

Heart muscles relax and chambers fill with blood

Blood is expelled from the heart

Valves close

Heart muscles contract

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

Immunity

Transportation of oxygen

Absorption of fats

Drainage of tissue fluid

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

Left side

Neither

Both sides

Right side

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

Valve

Myocardium

Pericardium

Septum

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

Coronary artery

Renal artery

Pulmonary artery

Carotid artery

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

Heartbeat

Gravity

Arterial pressure

Muscle contraction

38. What causes lymph to move in the body?

Muscle movement and valve action

High lymph pressure

Pumping of lymph nodes

Gravity

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

Peripheral nervous system

Somatic nervous system

Autonomic nervous system

Central nervous system

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

Veins

Capillaries

Arterioles

Arteries

41. Which blood vessel has the smallest diameter?

Venule

Vein

Capillary

Artery

42. The structure responsible for initiating the heartbeat is:

SA node

AV node

Vagus nerve

Bundle of His

43. Which organ is primarily responsible for producing lymphocytes?

Spleen

Kidney

Pancreas

Liver

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

Right atrium

Left atrium

Right ventricle

Left ventricle

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

Thymus

Liver

Bone marrow

Spleen

46. Where are lymph nodes most commonly found?

Under the skin

Inside bones

Along large blood vessels

In the heart

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

Inferior vena cava

Pulmonary vein

Superior vena cava

Aorta

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

Pulmonary artery

Vena cava

Pulmonary vein

Aorta

49. Arteries are characterized by:

Thick muscular walls and high pressure

Carrying blood toward the heart

Slow blood flow

Thin walls and valves

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Mustansar KhanLast Updated: June 14, 2025

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MDCAT Biology Circulation Online Test

MDCAT Biology Circulation Test

MDCAT Biology Circulation Chaper 11 Online Test

MDCAT Biology Circulation MCQS Online Test

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Mustansar Khan

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MDCAT Biology Circulation Test

MDCAT Biology Circulation Chaper 11 Online Test

MDCAT Biology Circulation MCQS Online Test

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Mustansar Khan

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