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romanna [79]
3 years ago
6

Someone please help me

Biology
1 answer:
Aleks [24]3 years ago
7 0
I would pick H but it might be J but I am pretty sure it is H so go with that ok if you need any thing else I will help you ok
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In Human anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.

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