What causes the movement of air in and out of the lungs? - ProProfs Discuss
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What causes the movement of air in and out of the lungs?



A. Diaphragm contracts and flattens
B. Inhalation & Exhalation
C. Difference in pressure
D. External intercostal muscles contract and internal intercostal muscles relax

This question is part of Respiration - Human Gaseous Exchange
Asked by Jeline, Last updated: Feb 22, 2020

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2 Answers

John Adney

John Adney

Answered Nov 28, 2016

Gaseous exchange is dependent on diffusion. diffusion depends on diffusion gradient i.e. difference in gaseous concentration between two regions. for air to move in and out of the lungs, the gaseous pressure in the lungs is not the same as atmospheric pressure.
 

John Smith

John Smith

Answered Nov 23, 2016

Difference in pressure
 

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