Action of heart in terms of blood.

Explain the action of the heart in terms of collecting blood, pumping bood and opening and closing valves. 

MUSCLE TISSUE - major component of the heart. 

The heart collects blood from the body and lungs in the right and left atria, respectively. 

The blood is then pumped into the right and left ventricles which are found below the atria. 

The RIGHT ventricle will pump the blood to the lungs. 

The wall is thicker than that of the atria but THINNER than that of the LEFT ventricle. 

The LEFT ventricle pumps blood into the aorta (rest of the body) This is the longest distance the blood travels, so needs to be pushed with force. This explain the thickest wall of the chambers of the heart. 

Mammals have double circulation

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