The Heart Explains about the heart structure, and the cardiac cycle. 2.0 / 5 based on 4 ratings ? BiologyCells, tissues and organsGCSE Created by: LauraCreated on: 16-04-10 09:00 What Does the Heart do? The heart is a muscular organ located in the thorax, which pumps blood continuously around the body. The blood supplies cells with substances needed around the body for respiration; oxygen and glucose. It also removes carbon dioxide, the waste product from respiration. The heart can also, respond to increase demand for energy during exercise. 1 of 3 Structure of the Human Heart. The heart is divided into a left heart, (which receives oxygenated blood)and a right heart (contains de oxygenated blood) . Each half consists of an upper atrium and a lower ventricle Attached to the heart are some major blood vessels, veins feed blood into the atria. The ventricles pushes the blood out of the heart through arteries. The heart contains 4 valves, which make sure that blood flows in only ONE direction. 2 of 3 Stages in the Cardiac Cycle. Blood moves into the heart. The left and right atria contract. Blood moves up through the bicuspid and tricupsid valves. The left and right ventricles contract. Blood moves through the semilunar valves. Blood enters the pulmonary artery and aorta. Blood is pumped out of the heart and around the body. 3 of 3
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