BIOL 2420 Lecture 18: Leture 18
8 Mar 2017
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Volume of air that moves into and out of lungs per breath (~500 ml at rest) Maximal volume that can be inspired (inhaled) following a normal inspiration. Decreases with age: expiratory reserve volume. Maximal volume that can be expired (exhaled) from the end of a norma expiration: residual volume. Volume air in lungs following maximal expiration: vital capacity. Maximal amount of air that can be exchanged per breath. We never want our lungs to lose all air (not possible in living/heathy human) The total ventilation per minute or minute ventilation". = 500ml/breath x 12 breaths/min = 6000 ml/min. Due to the anatomical dead space, however, only ~ 350ml of fresh air" is available for gas exchange per breath. Because the volume of the dead space does not change, depth of breath is far more important in increasing alveolar ventilation than respiratory rate. 150ml of o2 we had before and 150ml of co2 that never left.
