السؤال 103

Why is the heart classified as an organ rather than as a single tissue or the entire circulatory system?

It consists of one muscle cell only.
It includes every blood vessel in the body.
It is a tissue with no other tissue types.
It contains several tissues working together.الإجابة الصحيحة

الشرح

The heart contains several tissue types that cooperate within one structure, which meets the definition of an organ. It is only one component of the wider circulatory system, so it is not that entire organ system.

الشرح

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