BIOL 2420 Lecture Notes - Lecture 12: Alveolar Macrophage, Olfactory Mucosa, Angiotensin

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Unit 2: respiratory system (a: classification of respiration: external & internal, function of the respiratory system, respiration, external = the physical intake of oxygen and the exchange of co2 with the environment. Done with alveoli and blood vessels (alveoli exchange the gases with the blood vessels. Internal = cellular respiration (glucose + o2 co2) Gases fill this conducting zone, but they can"t be put through gas exchange because they"re not in the proper gas exchange location. Gases move by bulk flow: breathing in = diaphragm flattens, ribs move up and out (increases volume of thoracic cavity = lowered pressure (it"s below atmospheric pressure . 760mmhg: this decrease in pressure pulls gases in without additional help, breathing out = diaphragm moves out, ribs move in and down, volume decreases so pressure increases (expiration takes place passively) Incoming air is warmed and moistened as it enters the lungs (this keeps the respiratory surfaces in the way they ought to be)

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