how is blood pumped through the heart
The right auricle receives deoxygenated blood from the body, the blood is pumped to the right ventricle, which is pumped to the lungs to refill with oxygen. Each chamber holds about 70 ml of blood. The stroke volume is the volume of blood pumped through and out of the heart with each heartbeat. The total volume of the heart is therefore approximately 4 times that value, or 280 ml. The heart is made of relatively strong muscle.