-The right ventricle pumps blood through the pulmonary arteries to the lungs
for gas exchange.
-The blood becomes oxygenated.
-Oxygenated blood is collected by the pulmonary veins and returned to the
left atrium and then to the left ventricle.
-Contraction of left ventricle pumps oxygenated blood out of the heart through
the aorta and arteries to all parts of the body(except the lungs)
-When the blood reaches the capillaries supplying a tissue or an organ,
exchange of materials takes place
-Oxygen and nutrients diffuse from blood to the cells.
-Carbon dioxide and other wastes diffuse in the opposite direction.
-The blood then becomes deoxygenated.
-It is then carried by veins and drained into the right atrium through the
venae cavae.