Good Question! Well, What influences the amount of blood that leaves the heart is a Right and Left Artetery called a Ariticule. The blood is squirted out of these valves, and into the Veins of your body, Though whats known as the Aorta.
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the degree of stretching at the end of ventricular diastole, the contractility of the ventricle, the amount of pressure required to eject blood
to the heart
Oxygenated blood leaves the left side of the heart through the aorta,the largest artery and then to smaller arteries.Deoxygenated blood leaves the right side of the heart through the pulmonary artery then to arterioles and capillaries.
back to the heart
ARTERIES ALWAYS take blood AWAY from the heart.
Oxygenated blood is pumped out of the heart by the left ventricle.