Human Circulatory System Quiz - ICSE Class 8 Science

Free practice quiz: Human Circulatory System (ICSE Class 8 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 51 multiple-choice questions on Human Circulatory System, and 51 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which chamber of the heart receives deoxygenated blood from the body?

   1. Left atrium
   2. Right atrium
   3. Left ventricle
   4. Right ventricle
   Show answer

   Answer: B. Right atrium

   The right atrium is the chamber that receives deoxygenated blood returning from all parts of the body through the superior and inferior vena cava.

2. Which of the following is a function of the lymphatic system that complements the circulatory system?

   1. Transporting oxygen to tissues
   2. Returning excess tissue fluid back to the bloodstream
   3. Pumping blood throughout the body
   4. Removing carbon dioxide from the blood
   Show answer

   Answer: B. Returning excess tissue fluid back to the bloodstream

   The lymphatic system collects excess fluid (lymph) that leaks out of blood capillaries into the tissues and returns it to the bloodstream. This prevents tissue swelling (edema) and helps maintain blood volume.

3. The systemic circulation starts from which chamber of the heart?

   1. Right atrium
   2. Right ventricle
   3. Left atrium
   4. Left ventricle
   Show answer

   Answer: D. Left ventricle

   The left ventricle pumps oxygenated blood into the aorta, which is the beginning of the systemic circulation that supplies the rest of the body.

4. The force exerted by the blood against the walls of the blood vessels is known as:

   1. Cardiac output
   2. Blood pressure
   3. Heart rate
   4. Blood viscosity
   Show answer

   Answer: B. Blood pressure

   Blood pressure is the pressure of circulating blood against the walls of blood vessels. It is essential for blood flow throughout the body.

5. Which of the following valves prevents the backflow of blood from the aorta into the left ventricle?

   1. Tricuspid valve
   2. Mitral valve
   3. Pulmonary valve
   4. Aortic valve
   Show answer

   Answer: D. Aortic valve

   The aortic valve is a semilunar valve located between the left ventricle and the aorta. It opens to allow blood to be pumped into the aorta and closes to prevent blood from flowing back into the ventricle.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The pulmonary artery carries blood from the heart to which organ?
2. What is the primary function of red blood cells (erythrocytes)?
3. Which blood vessel carries oxygenated blood from the lungs to the heart?
4. The process of blood clotting is also known as:
5. Which component of blood is primarily responsible for the body's immune response?
6. The largest artery in the human body that carries oxygenated blood from the left ventricle is the:
7. Valves in the heart are crucial for:
8. What is the main function of plasma in the blood?
9. Deoxygenated blood from the body first enters which chamber of the heart?
10. What is the role of hemoglobin within red blood cells?
11. The double circulation of blood in humans means that:
12. Which condition is characterized by a significantly low red blood cell count or insufficient hemoglobin?
13. The pace-maker of the heart is also known as:
14. What is the main function of the coronary arteries?
15. Which of the following is NOT a component of blood?
16. The mitral valve (bicuspid valve) is located between which two chambers of the heart?
17. What causes the heartbeat to be heard as 'lub-dub'?
18. Which part of the circulatory system is responsible for gas exchange (oxygen and carbon dioxide) between the air and the blood?
19. Which blood vessels have the thinnest walls to facilitate diffusion?
20. What is the role of the sinoatrial (SA) node in the heart's electrical system?
21. Which substance is primarily transported by the blood to the body's cells for cellular respiration?
22. The process where white blood cells engulf and destroy foreign particles or pathogens is called:
23. When the ventricles contract, the atrioventricular (AV) valves close to:
24. Which blood component is responsible for transporting antibodies and other immune substances throughout the body?
25. The semilunar valves are located between the ventricles and which major blood vessels?
26. What is the term for the rhythmic expansion and recoil of arteries as blood is pumped through them?
27. Which artery supplies deoxygenated blood to the lungs?
28. Which cellular component of blood is crucial for initiating blood clotting?
29. The pulmonary circulation pathway involves blood flow between the heart and which organ?
30. What is the primary function of the atrioventricular (AV) node?
31. The main difference between arteries and veins is that arteries generally:
32. Which layer of the heart wall is primarily responsible for the heart's pumping action?
33. The concentration of carbon dioxide in the blood is highest in which vessels returning to the heart?
34. A person with a blockage in their coronary arteries is likely to experience:
35. Which of the following is a function of the spleen, which is closely related to the circulatory system?
36. The volume of blood pumped by each ventricle per minute is called:
37. When blood pressure is measured as 120/80 mmHg, what does the '80' represent?
38. What is the primary role of the pulmonary veins?
39. Which of the following is a component of plasma that helps in maintaining osmotic pressure and transporting substances?
40. The electrical impulse that triggers heart contraction travels through which pathway in the following order?
41. What is the condition where the heart muscle does not receive enough oxygenated blood?
42. Which of the following statements about the vena cava is correct?
43. The left atrium receives oxygenated blood from which part of the body?
44. The process of blood moving through the heart and around the body is called:
45. Which of the following is an abnormal widening or bulging of a blood vessel, often an artery?
46. The tricuspid valve is located between which two chambers of the heart?

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