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With regard to lung ventilation, what does “dead space” refer to?

waelhammad
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2022-10-19
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With regard to lung ventilation, what does “dead space” refer to?

  1. air in the conducting zone of the bronchial tree
  2. air remaining in the alveoli after an exhalation at maximal effort
  3. air between the parietal and visceral pleura
  4. the difference between the volume of a maximum inhalation and the tidal volume.
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waelhammad
2022-10-19
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A: Dead space refers to air that is inhaled into the airways but does not reach the alveoli, hence is exhaled again without participating in gas exchange. 

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