Circulatory System Quiz - CBSE Class 12 Biology

Free practice quiz: Circulatory System (CBSE Class 12 Biology). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Biology practice quiz has 18 multiple-choice questions on Circulatory System, and 18 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 primary function of the circulatory system?

   1. To facilitate digestion
   2. To transport nutrients and oxygen
   3. To assist in immune response
   4. To regulate temperature
   Show answer

   Answer: B. To transport nutrients and oxygen

   The circulatory system's main role is to transport nutrients, gases, hormones, and waste products throughout the body. It ensures that oxygen and nutrients reach tissues and organs, which is essential for life.

2. What is the name of the blood vessel that carries blood away from the heart?

   1. Vein
   2. Artery
   3. Capillary
   4. Nerve
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   Answer: B. Artery

   Arteries are blood vessels that carry blood away from the heart to various parts of the body, while veins carry blood back to the heart.

3. Which type of blood vessel connects arteries and veins?

   1. Capillaries
   2. Arterioles
   3. Venules
   4. Sinusoids
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   Answer: A. Capillaries

   Capillaries are small blood vessels that connect arteries and veins. They allow for the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues.

4. What happens to blood pressure as blood vessels constrict?

   1. Decreases
   2. Increases
   3. Remains constant
   4. Becomes erratic
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   Answer: B. Increases

   When blood vessels constrict, the resistance to blood flow increases, leading to a rise in blood pressure. This is a response to maintain blood flow under varying conditions.

5. What structure in the heart prevents the mixing of oxygenated and deoxygenated blood?

   1. Atrium
   2. Ventricle
   3. Septum
   4. Valve
   Show answer

   Answer: C. Septum

   The septum is a muscular wall that separates the left and right sides of the heart, preventing the mixing of oxygenated and deoxygenated blood.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What component of blood is responsible for oxygen transport?
2. Which organ is primarily responsible for pumping blood throughout the body?
3. What part of the heart prevents backflow of blood?
4. How is blood pressure measured?
5. What is the role of hemoglobin in red blood cells?
6. What is the circulatory system's role in thermoregulation?
7. Which type of blood cells are primarily involved in the immune response?
8. What is the main component of plasma?
9. Which structure allows the heart to receive deoxygenated blood?
10. What is the volume of blood in an average adult human?
11. What is the effect of exercise on heart rate?
12. Which part of the brain regulates heart rate?
13. How does hypertension affect the cardiovascular system?

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