goldenlover1225 goldenlover1225

23-12-2020
Biology

contestada

The first heart sound is made by

blood moving to the atria
blood moving to the ventricles
opening of the valve between the atria and the ventricles
closing of the valve between the atria and the ventricles

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24-12-2020

Closure of the valve (mitral valve and tricuspid valve)

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