left ventricle.
this has a thicker wall of muscle due to having to pump blood around the entire body from the heart. during ventricular systole it pushes blood through the open semi-lunar vavle of the aorta to pump blood around the entire body.
right ventricle
this has a thinner wall due to only having to pump blood a short distance to the lungs, the thinner wall enables it to pump blood at a thinner pressure and therefore prevent damage to the delicate capilaries and alveoli in the lungs.
left atrium
this recives blood from the inferior and superior vena cava which bring deoxygenated blood from the body. during atrial systole the blood is pushed through the atrioventicular valve (triscupid) annd into the right ventricle.
left atrium
the left atrium revieves oxygenated blood from the pulmonary vein from the lungs, this is the only time in the body where oxygenated blood travels in a vein. during atrial systole the blood is forced through the left atrioventricular valve (biscupid) into the left ventricle
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