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Notes on the Cardiovascular System


             Pulmonary semilunar valve on right side.
             Aortic semilunar valve on left side.
             Systole is contraction of chamber.
             Diastole is relaxation.
             During systole, a contraction is pumping blood out of chamber.
             During diastole, chamber is filling with blood.
             Heart movement called ventricular activity.
             Right side of heart pumps blood to lungs.
             Left ventricle pumps blood to body organs.
             When right ventricle full of blood the ventricle contracts.
             The tricuspid valve shuts so blood don't go back into right atrium.
             The blood then goes through pulmonary semilunar valve to pulmonary trunk, which divides into left and right pulmonary arteries.
             Each pulmonary artery goes to respective lung and branches down into smaller vessels where they become capillaries .
             The capillaries converge into larger vessels till they become left and right pulmonary vein.
             Pulmonary veins meet and pour blood into left atrium.
             Once left atrium full blood flows through AV valve into left ventricle.
             Left ventricle full it contracts forcing left AV valve shut and blood through aortic semilunar valve to ascending aorta, on way throughout body.
             Chambers of heart fill during diastole or the relaxation phase and eject blood during systole or contraction phase.
             DeO2 blood comes into right atrium through AV or tricuspid valve then right ventricle, then pulmonary valve open sending blood to lung via pulmonary artery. This blood gets oxygenated as it travels through capillary beds of lung then goes to left side of heart.
             Oxygenated blood returns from lung via pulmonary vein fills left atrium, then through bicuspid valve, then left ventricle, the aortic valve opens causing oxygenated blood to flow through aorta to deliver oxygen throughout body.
             Atria walls thinner than ventricular walls because higher pressure in ventricles to move blood.
             Walls of left ventricle thicker than right ventricle cause right ventricle has to pump blood short distance through lungs and back to heart.


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