Which structure is NOT included in the circulatory system?

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Multiple Choice

Which structure is NOT included in the circulatory system?

Explanation:
The circulatory system is the heart, blood, and the vessels that carry blood throughout the body. Lymphatics belong to the lymphatic system, a separate network that drains interstitial fluid as lymph and supports immune function. While lymphatic vessels eventually return fluid to the venous blood, the fluid they transport is lymph, not blood, so they are not part of the circulatory circuit. Therefore, the structure not included in the circulatory system is the lymphatics.

The circulatory system is the heart, blood, and the vessels that carry blood throughout the body. Lymphatics belong to the lymphatic system, a separate network that drains interstitial fluid as lymph and supports immune function. While lymphatic vessels eventually return fluid to the venous blood, the fluid they transport is lymph, not blood, so they are not part of the circulatory circuit. Therefore, the structure not included in the circulatory system is the lymphatics.

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