Multiple choice general knowledge science & technology

Which is not a part of the circulatory system?

  1. lung

  2. heart

  3. blood

  4. none of the above
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A Correct answer
Explanation

The lung is part of the respiratory system, exchanging oxygen and carbon dioxide. The circulatory system comprises the heart, blood vessels (arteries, veins, capillaries), and blood - which transport materials throughout the body. Lungs and heart work together but belong to different systems.

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