Which of these is not an organ system?
(a) heart
(b) respiratory
(c) digestive
(d) excretory

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Solution

(a) heart.
Heart is an organ, and not an organ system. It is one of the main organs in the circulatory system.

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Which of these is not an organ system? (a) heart (b) respiratory (c) digestive (d) excretory

(a) heart. Heart is an organ, and not an organ system. It is one of the main organs in the circulatory system.

Which of these is not an organ system?
(a) heart
(b) respiratory
(c) digestive
(d) excretory

(a) heart.
Heart is an organ, and not an organ system. It is one of the main organs in the circulatory system.