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Lesson 14 How does your heart work? Place your hand on your chest. What do you feel? Your heart beats nonstop for your whole life, keeping you alive. It pumps blood to all parts of your body. The human heart is divided into four separate spaces called chambers. Two chambers are in the upper part of the heart; two chambers are in the lower part of the heart. Atria are the upper chambers of the heart. A single atria is called an atrium. There is a right and left atrium. Atria receive blood. The right atrium receives blood from all parts of the body. This blood is high in carbon dioxide and low in oxygen The left atrium receives blood from the lungs. This blood is high in oxygen and low in carbon dioxide. Both atria fill with blood at the same time!!!!! Ventricles: are the lower chambers of the heart. They pump blood out of the heart. The right ventricle pumps blood to the lungs. This blood is high in carbon dioxide and low in oxygen. In the lungs, the blood gives up its carbon dioxide and takes in oxygen. The left ventricle pumps blood to all parts of the body except the lungs. Blood in the left ventricle is high in oxygen and low in carbon dioxide. Both ventricles pump blood out of the heart at the same time. Every time your heart beats, blood is “squeezed” out of the ventricles. Blood moves in only one direction only. The heart and veins have valves that keep blood from moving backwards. A valve is a flap of tissue that works like a one way swinging door. The septum is a thick muscular wall that separates the two sides of the heart. Blood can not flow from one side to the other.