Circulatory System Quiz - CBSE Class 8 Science

Free practice quiz: Circulatory System (CBSE Class 8 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 8 Science practice quiz has 20 multiple-choice questions on Circulatory System, and 20 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. What is the main function of the heart in the circulatory system?

   1. To filter blood
   2. To pump blood
   3. To produce hormones
   4. To digest food
   Show answer

   Answer: B. To pump blood

   The main function of the heart is to pump blood throughout the body, supplying oxygen and nutrients to tissues.

2. How does the circulatory system help maintain homeostasis?

   1. By digesting food
   2. By regulating temperature
   3. By excreting waste
   4. By absorbing nutrients
   Show answer

   Answer: B. By regulating temperature

   The circulatory system helps maintain homeostasis by regulating body temperature through the distribution of heat and blood flow.

3. What happens to blood pressure during exercise?

   1. It decreases
   2. It stays the same
   3. It increases
   4. It fluctuates randomly
   Show answer

   Answer: C. It increases

   During exercise, the heart pumps harder and faster to supply oxygen-rich blood to the muscles, causing blood pressure to increase.

4. What is the term for the network of blood vessels throughout the body?

   1. Vascular system
   2. Nervous system
   3. Digestive system
   4. Endocrine system
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   Answer: A. Vascular system

   The vascular system is the network of blood vessels that facilitate blood circulation throughout the body.

5. What kind of vessel is responsible for returning deoxygenated blood to the heart?

   1. Arteries
   2. Capillaries
   3. Veins
   4. Lymphatic vessels
   Show answer

   Answer: C. Veins

   Veins are responsible for returning deoxygenated blood back to the heart after oxygen has been delivered to the body's tissues.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which type of blood vessel carries oxygen-rich blood away from the heart?
2. What component of blood is responsible for transporting oxygen?
3. What is the role of platelets in the blood?
4. What is the significance of the circulatory system in transporting nutrients?
5. What is the role of the aorta in the circulatory system?
6. Which organ is primarily responsible for filtering blood?
7. Which of the following is a function of the circulatory system?
8. What type of exercise is best for strengthening the heart?
9. What can high cholesterol levels lead to in the circulatory system?
10. What is the significance of the pulmonary circulation?
11. What is an arrhythmia?
12. Which structure in the heart prevents the backflow of blood?
13. What is the main reason for the heart’s chambers to open and close?
14. What role do capillaries play in the circulatory system?
15. What disease can be caused by blocked blood vessels due to plaque buildup?

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