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Phase when ventricles contract.

A trioventricular valves close preventing back- flow into the auricles.

Volume of the ventricles decreases while pressure increases to force blood out of the heart to the:

(i)Lungs via semi-lunar valves through the pulmonary artery

(ii)Body tissues except the lungs via the semi-lunar valves through the aorta.

The thick cardiac muscles of the left which left ventricles which generate high pressure which forces the blood to the furthest tissue in the body .