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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 is the average duration of the cardiac cycle?

1.0 second

0.8 second

2.0 seconds

0.2 seconds

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

Right ventricle

Right atrium

Left atrium

Left ventricle

3. What causes lymph to move in the body?

Gravity

Muscle movement and valve action

High lymph pressure

Pumping of lymph nodes

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

Peripheral nervous system

Central nervous system

Somatic nervous system

Autonomic nervous system

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

Left ventricle

Right ventricle

Right atrium

Left atrium

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

Liver

Pancreas

Spleen

Kidney

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

Neither

Both sides

Left side

Right side

8. Which organ is primarily responsible for producing lymphocytes?

Kidney

Liver

Pancreas

Spleen

9. What type of blood do pulmonary arteries carry?

Mixed

Filtered

Oxygenated

Deoxygenated

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

Ventricular systole

Atrial systole

Ventricular diastole

Atrial diastole

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

Red blood cells

White blood cells

Platelets

Plasma

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

Absorption of fats

Immunity

Transportation of oxygen

Drainage of tissue fluid

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

Inferior vena cava

Superior vena cava

Aorta

Pulmonary vein

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

Right atrium

Left atrium

Left ventricle

Right ventricle

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

Veins

Capillaries

Lymph vessels

Arteries

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

Coronary circulation

Systemic circulation

Pulmonary circulation

Hepatic circulation

17. What is the function of the lymph nodes?

Transport oxygen

Pump lymph

Store blood

Filter lymph and fight infection

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

Vena cava

Aorta

Pulmonary artery

Left atrium

19. Which layer of the heart contains cardiac muscle?

Endocardium

Myocardium

Pericardium

Epicardium

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

Renal artery

Coronary artery

Pulmonary artery

Carotid artery

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

Valves

Septum

Arteries

Myocardium

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

Heartbeat

Arterial pressure

Muscle contraction

Gravity

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

Oxygen transport

Hormone transport

Defense against infection

Blood clotting

24. Arteries are characterized by:

Thick muscular walls and high pressure

Carrying blood toward the heart

Thin walls and valves

Slow blood flow

25. What occurs during diastole?

Blood is expelled from the heart

Valves close

Heart muscles relax and chambers fill with blood

Heart muscles contract

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

Semilunar valves

Atrioventricular valves

Tricuspid valves

Pulmonary valves

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

Myocardium

Pericardium

Septum

Valve

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

Arteries

Capillaries

Veins

Arterioles

29. What is the function of capillaries in tissues?

Maintain blood pressure

Exchange nutrients and gases

Store blood

Prevent infection

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

Veins

Arterioles

Capillaries

Arteries

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

Aorta

Pulmonary vein

Vena cava

Pulmonary artery

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

SA node

Aortic valve

Purkinje fibers

AV node

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

Right lymphatic duct

Subclavian artery

Thoracic duct

Jugular vein

34. What initiates the heartbeat in the human heart?

Purkinje fibers

Bundle of His

AV node

SA node

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

Left ventricle

Right ventricle

Left atrium

Right atrium

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

Atrial diastole

Ventricular systole

Atrial systole

Ventricular diastole

37. The structure responsible for initiating the heartbeat is:

Vagus nerve

AV node

Bundle of His

SA node

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

Renal vein

Aorta

Capillary

Thoracic duct

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

Liver

Spleen

Thymus

Bone marrow

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

Right ventricle

Left ventricle

Right atrium

Left atrium

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

Red blood cells

Water and proteins

White blood cells

Plasma

42. Where are lymph nodes most commonly found?

Under the skin

Inside bones

In the heart

Along large blood vessels

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

Arterioles

Veins

Capillaries

Arteries

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

Pulmonary valve

Aortic valve

Bicuspid valve

Tricuspid valve

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

Amino acids

Fats

Water

Glucose

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

Right side

Left side

Neither

Both sides

47. Which blood vessel has the smallest diameter?

Venule

Artery

Capillary

Vein

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

Bicuspid (mitral) valve

Pulmonary valve

Aortic valve

Tricuspid valve

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

Blood entering the atria

Contraction of heart muscles

Closing of heart valves

Opening of heart 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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