BIOL273 Chapter Notes - Chapter 17: External Intercostal Muscles, Tidal Volume, Alveolar Pressure

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The bones and muscles of the thorax assist with ventilation: the intercostal muscles connect the ribs, sternocleidomastoids and scalenes run from the head of the neck to the sternum and first 2 ribs. Gas laws: boyle"s law: p1v1=p2v2, as volume increases, pressure decreases, dalton"s law: pp= patm. x %gas in atmosphere, the total pressure of a mixture of gases is the sum of the partial pressures that each gas exhibits. Ventilation the bulk flow of exchange between the atmosphere and the alveoli is ventilation or breathing: a single respiratory cycle consists of an inspiration, followed by an expiration. Changes in lung volume during ventilation: pulmonary function tests use a spirometer to measure how much air moves during a persons respiratory cycle, tidal volume refers to the volume of air that moves during a single, normal inspiration. Inspiratory capacity refers tidal volume plus the inspiratory reserve volume: functional residual capacity refers to the expiratory reserve volume plus the residual volume.

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