Question

The beating of your heart is caused by _____.

valves opening and closing
contraction of heart
blood moving through the heart
relaxation of the heart

Answer 1

contraction of the heart

Answer 2

just think of it this way your heart is like a water pump and the contractions are like when you pump the water by pushing the lever up and down (that's how I think of it^_^)

Answer 3

If this helped @Boothepest1 could you please give me a medal?

Answer 4

Beating of the heart is caused of opening and closing of the valves. As you are listening with a stethoscope, you are aclually listening the valves.