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9 August, 14:16

Calculate the intrapleural pressure if atmospheric pressure is 765 millimeters of mercury, assuming that the subject is at rest (not inhaling or exhaling).

A. 4 millimeters of mercury

B. 0 millimeters of mercury

C. 761 millimeters of mercury

D. 765 millimeters of mercury

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Answers (1)
  1. 9 August, 18:06
    0
    C. 761 millimeters of mercury

    Explanation:

    Because it is at rest, the intrapulmonary pressure must be equal to the atmospheric pressure. And the intrapleural pressure is usually 4 millimeters of mercury (mmHg) less than the intrapulmonary pressure. So we have the following

    intrapulmonary pressure = 765 millimeters of mercury

    intrapleural pressure = intrapulmonary pressure - 4 millimeters of mercury

    Then:

    intrapleural pressure = (765 - 4) millimeters of mercury

    intrapleural pressure = 761 millimeters of mercury
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