Respiration, Digestion, and Excretion Question
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Breathing occurs in a predictable series of steps. First, air flows from the nostrils or mouth through the pharynx/ larynx (which is located at the back of the throat). Then, the air moves through the trachea , a long pipe like structure, to the bronchi where the air is further moved to the location where gas transfer occurs, the alveoli , small air sacs located in the lungs.