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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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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

User Somum
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1 Answer

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Closure of the valve (mitral valve and tricuspid valve)
User Mr Cold
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