respiratory system
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Your respiratory system provides the energy needed by cells of the body. Air is breathed in through the nasal cavity and/or mouth and down through the throat (the pharynx).
The throat has 3 parts:
- The nasopharynx,
- The oropharynx,
- The laryngopharynx.
The air passes down the trachea (the windpipe), through the left and right bronchi, and into the lungs.
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Oxygen in the blood is delivered to body cells, where the oxygen and glucose in the cells undergo a series of reactions to provide energy to cells, and the waste product of this process is carried out of the lungs.
The larynx is your voice box; the epiglottis, a flap of cartilage that prevents food from entering the trachea; and the esophagus, the tube through which food passes to the stomach.
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