isaiahsolis199ownk66 isaiahsolis199ownk66

22-09-2017
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Why does your heart never tire of constantly beating to pump blood throughout your body?

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Аноним Аноним

22-09-2017

I think it consist of cardiac muscle tissues, which means it moves involuntarily.

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mario53 mario53

22-09-2017

Because it's a muscle

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