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GCSE CCEA The circulatory system (CCEA)Blood is pumped away from the heart at high pressure in arteries, and returns to the heart at low pressure in veins. The human circulatory system is a double circulatory system. Part of Biology (Single Science) Body systems
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The heartThe heart is a unidirectional pump. Valves are present to prevent the backflow of blood. The right side pumps deoxygenated blood (low in oxygen and high in carbon dioxide) to the lungs. The left side pumps oxygenated blood (high in oxygen and low in carbon dioxide) to the organs of the body.
This unidirectional flow of blood through the heart shows that mammals have a double circulatory system. This means blood travels through the heart twice in one circulation of the body. Ventricular walls are thicker than atrial walls because the ventricles have to pump blood further. The left ventricle wall is thicker than the right because it pumps blood around the body while the right pumps blood to the lungs, located close to the heart. The following arteries and veins transport blood to and from some of the body’s organs:
The oxygen and glucose carried in oxygenated blood is used for respiration in the body’s cells. The coronary arteries provide the heart muscle with the glucose and oxygen it needs for respiration. These are small blood vessels that branch off the aorta and can be seen on the external surface of the heart.
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