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The circulatory system is important because it provides oxygen to the muscles and pumps blood to the rest of the body. Low oxygenated blood enters the right atrium through a vein call the vena cava. Then the blood goes through the tricuspid valve into the right ventricle. Now the blood is pumped the pulmonary artery up the lung where the gas exchange occurs. That mean that the CO2 is exchanged with oxygen and is then sent down to the left atrium through the pulmonary vein. Oxygenated blood then goes down to the left ventricle through the bicuspid valve then goes to a large artery called the aorta which then branches off  to different arteries until it gets to the muscles where the muscles trade oxygen for CO2. Then the blood goes through the veins to the kidneys to filter out the waste in the blood then it goes through the veins back to the heart and then the process starts over again when the heart beats.

~ by Ethan Evans on .