isaiahsolis199ownk66 isaiahsolis199ownk66
  • 22-09-2017
  • English
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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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