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.
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What is the primary function of the circulatory system?
- To facilitate digestion
- To transport nutrients and oxygen
- To assist in immune response
- To regulate temperature
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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.
What is the name of the blood vessel that carries blood away from the heart?
- Vein
- Artery
- Capillary
- 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.
Which type of blood vessel connects arteries and veins?
- Capillaries
- Arterioles
- Venules
- 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.
What happens to blood pressure as blood vessels constrict?
- Decreases
- Increases
- Remains constant
- 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.
What structure in the heart prevents the mixing of oxygenated and deoxygenated blood?
- Atrium
- Ventricle
- Septum
- Valve
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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.