Guyton & Hall Physiology Review (Guyton Physiology) by Hall John E

Author:Hall, John E. [Hall, John E.]
Language: eng
Format: epub
Publisher: Elsevier Health
Published: 2011-02-24T22:00:00+00:00

14.B) Alveolar ventilation = Frequency * (VT − VD) = 15/min * (650 − 150) = 7.5 L/min TMP12 472

15.C) Pleural pressure during inhalation is always less than alveolar or atmospheric. TMP12 465–466

16.E) Total ventilation is equal to the tidal volume (VT) times the ventilation frequency (Freq). Alveolar ventilation = (VT − VD) × Frequency, where VD is the dead space volume. Both individuals have the same total ventilation: subject T, 1000 × 10 = 10 L/min; subject V, 500 × 20 = 10 L/min. However, subject T has an alveolar ventilation of 18 L (that is, (2000 − 200) × 10)); whereas subject V has an alveolar ventilation of only 12 L (that is, (500 − 200) × 40)). This problem further illustrates that the most effective means of increasing alveolar ventilation is to increase the tidal volume, not the respiratory frequency. TMP12 471–472

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