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During quiet breathing, one phase of ventilation is considered passive and one active. What does that...

During quiet breathing, one phase of ventilation is considered passive and one active. What does that mean and why? Which of the respiratory muscles is primarily responsible for this process? How is this different from forced breathing or exercise induced breathing?

Science   Anatomy-And-Physiology   
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Answer #1

The active phase means inhalation is by the contaction of diaphragm and the external intercostal muscles.This process requires energy so inhalation is active process.

The passive phase means exhalation is by the relaxation of diaphragm and the external intercostal muscles.This process doesn't require energy.So it is passive process.

During forced breathing abdominal muscles contract so during exercise induced breathing exhalation is also active and require energy.

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