Practice Quiz

COMLEX Osteopathic Medicine

Category - Respir./Circul

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In order for inhalation to work properly, which of the following must be true?
  1. The atmospheric pressure must be higher than alveolar pressure.
  2. The atmospheric pressure must be lower than alveolar pressure.
  3. The atmospheric pressure has nothing to do with inhalation.
  4. The atmospheric pressure must remain constant at all times.
Explanation
Answer - A - Inhalation requires the atmospheric pressure to be higher than alveolar pressure because air naturally flows from areas of high pressure to areas of low pressure. During inhalation, the lungs expand, which causes the pressure of the alveoli to decrease slightly so that air can flow.
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