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What is the pressure of gas within the alveoli at the peak of inspiration, just before expiration, relative to that of atmospheric air?
  • a)
    Less than atmospheric air
  • b)
    Greater than atmospheric air
  • c)
    Cannot be predicted without more information
  • d)
    The same as atmospheric air
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
What is the pressure of gas within the alveoli at the peak of inspirat...
The pressure of gas within the alveoli at the peak of inspiration, just before expiration, is the same as atmospheric air.
Explanation: During the peak of inspiration, just before expiration, the pressure of gas within the alveoli is equal to atmospheric pressure. This occurs when the lungs are at their maximum inhalation and the volume of the alveoli is increased.
At rest, the respiratory system operates under the principle of equalizing pressure between the alveoli and the atmosphere. The pressure within the alveoli is maintained at atmospheric pressure to ensure efficient exchange of gases between the alveoli and the pulmonary capillaries.
During inspiration, the diaphragm and other respiratory muscles contract, causing the thoracic cavity to expand. This expansion leads to an increase in lung volume, resulting in a decrease in alveolar pressure. As a result, air flows from the atmosphere, where the pressure is higher, into the alveoli to equalize the pressures.
At the peak of inspiration, when the inhalation is at its maximum, the pressure within the alveoli is the same as atmospheric pressure. This allows for effective gas exchange to occur in the lungs.
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