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bogdanovich [222]
4 years ago
9

Valves of the heart open and close due to ________. Valves of the heart open and close due to ________. pressure changes timing

sequences contraction of papillary muscles electrical signals None of the answers are correct.
Biology
1 answer:
stealth61 [152]4 years ago
8 0

Answer: pressure changes

Valves of the heart open and close due to pressure changes

Explanation:

The veins are the blood vessels possessing valves. And because they carry blood away from the heart, the valves helps to prevent back flow of blood due to the low pressure of blood found in the veins.

Thus, Valves of the heart open and close due to pressure changes

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Write a five sentence paragrgh explaining the cell cycle
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from online, rephrase this use as reference

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