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.

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
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   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
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   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
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   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
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   Answer: C. Veins

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

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