Multiple choice

Which of the following is not a part of circulatory system?

  1. Heart

  2. Blood vessels

  3. Blood

  4. Kidneys
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The circulatory system consists of the heart, blood vessels, and blood working together to transport substances. The kidneys are part of the excretory system, responsible for filtering waste products from the blood to form urine. While they interact closely with blood, they are not anatomically part of the circulatory system.

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