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An increase in air pressure in the lungs is due to the

Biology
JAMB 2006

An increase in air pressure in the lungs is due to the

  • A. increase in the volume of the thoracic cavity
  • B. upward movement of the ribs
  • C. relaxation of the diaphragm
  • D. contraction of the intercostal musles
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Correct Answer: Option C
Explanation

As the diaphragm and intercostal muscles relax, the lungs and thoracic tissues recoil, and the volume of the lungs decreases. This causes the pressure within the lungs to increase above that of the atmosphere, causing air to leave the lungs.Muscle contraction and relaxation are not the same; contraction is the tightening or shortening of muscles, while relaxation is the return of the muscle fibers to a low-tension state. 

There is an explanation video available below.


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Explanation Video

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