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LectureNotes28-35

LectureNotes28-35 - Lecture 28 Respiratory Physiology I...

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Lecture 28: Respiratory Physiology I Reading: ch 13, section: intro, mechanics, pgs 461-472 (pgs 451-463, if using 6 th edition) (pgs 459-471, if using 5 th edition) Respiration - Respiration, the process of obtaining O 2 from the environment and eliminating CO 2 from the body, can be subdivided into 2 separate processes. internal respiration - this refers to the intracellular metabolic processes that take place within mitochondria, which use O 2 and produce CO 2 during the derivation of energy from nutrient molecules. external respiration - this refers to the entire sequence of events involved in exchanging O 2 and CO 2 between the environment and the cells of the body. It is composed of four subprocesses, the first two of which are accomplished by the respiratory system . 1) breathing - the alternate movement of air in and out of the lungs to exchange gas between the environment and the alveoli . 2) alveolar gas exchange - exchange of O 2 and CO 2 between gas in the alveoli and blood in the pulmonary capillaries 3) gas transport - the transport of O 2 and CO 2 by the blood from the lungs to the tissues of the body 4) blood gas exchange - the exchange of O 2 and CO 2 between the blood and the tissues Respiratory System - the system responsible for the first two stages of external respiration. Respiratory Airways - these are the tubes that carry air between the atmosphere and the alveoli. nasal passages - nose
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