What is the lub-dub sound of a heartbeat? blood moving through the arteries and veins pacemaker controlling the heart rate atria contracting followed by the ventricles valves of the heart closing

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asked Mar 28, 2020 114k views

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What is the lub-dub sound of a heartbeat? blood moving through the arteries and veins pacemaker controlling the heart rate atria contracting followed by the ventricles valves of the heart closing

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middle-school

Paulwhit asked

by Paulwhit

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5 votes

Answer:

D. valves of the heart closing

Step-by-step explanation:

Sahin Erbay answered Mar 30, 2020

by Sahin Erbay

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4 votes

Atria contracting followed by the ventricles' valves of the heart closing

Terry Harvey answered Apr 1, 2020

by Terry Harvey

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