Which organ is part of the circulatory system?

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Multiple Choice

Which organ is part of the circulatory system?

Explanation:
The heart is the pumping organ that keeps blood moving through the body, which is the defining role of the circulatory system. It contracts to push oxygen-rich blood to tissues and then receives and returns blood back to the lungs for gas exchange, maintaining circulation throughout the body. Lungs are part of the respiratory system, essential for exchanging oxygen and carbon dioxide with blood. The brain belongs to the nervous system, directing body functions, and the skin is part of the integumentary system, serving as a protective barrier and also containing blood vessels but not acting as a central pumping organ.

The heart is the pumping organ that keeps blood moving through the body, which is the defining role of the circulatory system. It contracts to push oxygen-rich blood to tissues and then receives and returns blood back to the lungs for gas exchange, maintaining circulation throughout the body.

Lungs are part of the respiratory system, essential for exchanging oxygen and carbon dioxide with blood. The brain belongs to the nervous system, directing body functions, and the skin is part of the integumentary system, serving as a protective barrier and also containing blood vessels but not acting as a central pumping organ.

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