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WITCHER [35]
2 years ago
9

In the cardiac cycle,

Biology
1 answer:
USPshnik [31]2 years ago
8 0
That would be B.

During ventricular systole both atria relax while the 2 ventricles contract and send blood into the arteries.

The rest of choices are wrong,
The atria contract at the same time.
All 4 chambers never contract or are in systole at the same time.
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