give external diagram of heart .......
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What is Heart?
Heart is a organ that pumps the blood through the circulatory system by rhythmic contraction and Relaxation.
*Diagram is in Attachment...
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Attachments:
![](https://hi-static.z-dn.net/files/d19/5e8116d6abfb39b403e2fd718fd6786a.jpg)
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