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The Circulatory System The Heart: The circulatory pump! Heart pumps the blood through the blood vessels The heart is made up of 2 pumps (the right and left pumps) Each pump has two chambers – an atrium (which receives blood) and a ventricle (which pumps out blood) Blood is directed through the heart through a system of one-way valves (can’t move backwards) Arteries: Blood vessels that carry blood away from the heart towards the capillaries. Capillaries: Thin walled vessels that branch from the arteries into the spaces between the body cells. This is where the exchange of materials between the blood and cells takes place. Veins: Blood vessels that carry blood towards the heart after receiving it from the capillaries. The Circulatory System 1. Superior vena cava returns less oxygenated blood to the heart from the body. 2. The right atrium receives less oxygenated blood and pumps it to the right ventricle. 3. The right ventricle pumps it out of the heart and to the lungs via the pulmonary artery. 4. In the lungs, the blood now releases carbon dioxide (CO2 )and picks up O2 . 5. This oxygenated blood now returns to the heart via the pulmonary vein and it enters the left atrium. 6. The left atrium then pumps it into the left ventricle. 7. Now this oxygenated blood is pumped out of the thick and powerful left ventricle and to the rest of the body via the aorta. B. Questions 1. Name the 4 main chambers of the heart. Right atrium Left atrium Right ventricle Left ventricle 2. List the 3 different types of blood vessels. Arteries Veins Capillaries 3. Which chambers of the heart carry less oxygenated blood? Right atrium Right ventricle 4. The actual exchange of gas in the lungs occurs between the and the alveoli. capillaries 5. Less oxygenated blood returning from your leg would enter the heart via the inferior vena cava 6. This vessel sends freshly oxygenated blood out of the heart to the rest of the body: aorta .