Respiratory system - developmental changes, Biology

Respiratory System - Developmental Changes after Birth

The new-born's lungs are collapsed and need powerful breaths to inflate them; airways too are small, offering remarkable resistance to flow of air. The surface tension tends to hold the moist membranes together. The lungs of a full term baby secrete surfactant that has the unique property of exerting high surface tension while the lungs an expanded but a low surface tension while the lungs are collapsed. So after the first powerful breath which expands the lungs, breathing becomes easier, due to the reduced surface tension of collapsed lungs.

Posted Date: 2/1/2013 3:15:41 AM | Location : United States

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