Learn about The Respiratory System in this educational video from dizzo95.
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Male Speaker: The human respiratory system exchanges oxygen from the air for carbon-dioxide produced by the body. The center of the system is the lungs, two elastic cone shaped sacks that nearly fill the chest cavity. The actual mechanism where the gas exchange occurs is the alveoli, a tiny cluster of air sacks. When we inhale through our nose and mouth air passes through the trachea and infiltrates the lungs through a network of tubes whose branches become finer and finer until they reach the clusters of alveoli. The alveoli are surrounded by capillaries; minute blood vessels that allow the blood to observe oxygen. These capillaries also allow the blood to release its carbon-dioxide, which is then exhaled. Breathing is accomplished with diaphragm, a strong muscle under the lungs. During inhalation, the diaphragm and the rib cage expand the chest cavity causing the lungs to suck in air with fresh oxygen. During exhalation the diaphragm relaxes, compressing the lungs to force out the air with waste carbon-dioxide.