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cardiovascular system and its functions
CA RDIOVASCULAR SYSTEM Cardiovascular system is a closed system through which blood flows throughout the body supplying nutrients and oxygen to tissues and removing wastes and carbondioxides. It's includes HEART and BLOODVESSELS. Heart pumps blood into the blood vessels.Blood vessels circulate the blood throughout the body. Functions : 1. Oxygen and carbondioxiode transport; Supplying oxygen to the body is the most essential functions of the cardiovascular system.Although all cells require oxygen,brain cells are the most sensitive and begin to die as little as 3minutes ,if oygen supply is stopped. During inhalation ,air enters the lungs and oxygen is absorbed through the air sac into the blood stream.This oxygen rich blood is pumped through the heart into the artrial circulation. In...
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