Answer:
A heartbeat is a two-part pumping action that takes about a second.
hope it helps
Explanation:
Heart beat is a sound produced by contraction and relaxation of the four valves of the heart. A heart produces two sound lub and dub which make one heartbeat.
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Answers & Comments
Answer:
A heartbeat is a two-part pumping action that takes about a second.
hope it helps
Explanation:
Heart beat is a sound produced by contraction and relaxation of the four valves of the heart. A heart produces two sound lub and dub which make one heartbeat.