Multiple choice

Which of the following does not characterise closed circulatory system?

  1. Blood flows at high speed.

  2. The blood itself increases the efficiency of circulation.

  3. The blood flows in blood vessels only.

  4. The volume of blood is independent of the muscles of the blood vessels.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In this type of circulatory system, the volume of blood flowing through any organ of the body is regulated by the contraction and relaxation of the muscles of the blood vessels.

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