168k views
15 votes
Heart sounds are caused by

A
contraction of the heart muscle
B
relaxation of the heart muscle
С
closing of the heart valves
D
movement of blood through the body

2 Answers

12 votes
It’s A

I hope this helps
User Gary Wisniewski
by
8.7k points
6 votes
Contraction of the heart muscle
User Saransh Malik
by
8.7k points
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