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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. 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

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

1.0 second

2.0 seconds

0.8 second

0.2 seconds

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

Myocardium

Valve

Septum

Pericardium

4. What causes lymph to move in the body?

Gravity

Muscle movement and valve action

Pumping of lymph nodes

High lymph pressure

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

Aortic valve

Tricuspid valve

Pulmonary valve

Bicuspid (mitral) valve

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

Left atrium

Vena cava

Aorta

Pulmonary artery

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

Coronary circulation

Systemic circulation

Pulmonary circulation

Hepatic circulation

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

Arteries

Veins

Lymph vessels

Capillaries

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

Vena cava

Pulmonary vein

Aorta

Pulmonary artery

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

Arteries

Septum

Myocardium

Valves

11. What type of blood do pulmonary arteries carry?

Oxygenated

Mixed

Deoxygenated

Filtered

12. Where are lymph nodes most commonly found?

Under the skin

Along large blood vessels

In the heart

Inside bones

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

Renal artery

Coronary artery

Pulmonary artery

Carotid artery

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

Atrioventricular valves

Tricuspid valves

Semilunar valves

Pulmonary valves

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

Neither

Right side

Both sides

Left side

16. What is the function of the lymph nodes?

Store blood

Pump lymph

Transport oxygen

Filter lymph and fight infection

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

Gravity

Heartbeat

Muscle contraction

Arterial pressure

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

Water and proteins

Plasma

White blood cells

Red blood cells

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

Liver

Bone marrow

Thymus

Spleen

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

Aortic valve

SA node

AV node

Purkinje fibers

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

Left side

Neither

Both sides

Right side

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

Water

Glucose

Fats

Amino acids

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

Left ventricle

Right ventricle

Right atrium

Left atrium

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

Somatic nervous system

Central nervous system

Peripheral nervous system

Autonomic nervous system

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

Atrial systole

Ventricular diastole

Ventricular systole

Atrial diastole

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

Aorta

Capillary

Thoracic duct

Renal vein

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

Blood clotting

Defense against infection

Oxygen transport

Hormone transport

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

Left atrium

Left ventricle

Right atrium

Right ventricle

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

Left ventricle

Left atrium

Right ventricle

Right atrium

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

Red blood cells

Plasma

Platelets

White blood cells

31. Which organ is primarily responsible for producing lymphocytes?

Liver

Spleen

Pancreas

Kidney

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

Capillaries

Arteries

Arterioles

Veins

33. The structure responsible for initiating the heartbeat is:

Vagus nerve

AV node

Bundle of His

SA node

34. Which layer of the heart contains cardiac muscle?

Endocardium

Pericardium

Myocardium

Epicardium

35. Which blood vessel has the smallest diameter?

Artery

Capillary

Venule

Vein

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

Pulmonary vein

Superior vena cava

Inferior vena cava

Aorta

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

Ventricular diastole

Atrial systole

Atrial diastole

Ventricular systole

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

Arteries

Veins

Capillaries

Arterioles

39. What is the function of capillaries in tissues?

Prevent infection

Store blood

Maintain blood pressure

Exchange nutrients and gases

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

Pancreas

Spleen

Liver

Kidney

41. What initiates the heartbeat in the human heart?

SA node

AV node

Purkinje fibers

Bundle of His

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

Arteries

Capillaries

Veins

Arterioles

43. Arteries are characterized by:

Carrying blood toward the heart

Thick muscular walls and high pressure

Thin walls and valves

Slow blood flow

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

Right ventricle

Right atrium

Left ventricle

Left atrium

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

Transportation of oxygen

Absorption of fats

Drainage of tissue fluid

Immunity

46. What occurs during diastole?

Heart muscles contract

Heart muscles relax and chambers fill with blood

Blood is expelled from the heart

Valves close

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

Right lymphatic duct

Thoracic duct

Jugular vein

Subclavian artery

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

Aortic valve

Tricuspid valve

Pulmonary valve

Bicuspid valve

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

Right ventricle

Left atrium

Right atrium

Left ventricle

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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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