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Harsh dev
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Asked: 2021-12-10T10:42:05+00:00 In:

What causes the change in air pressure during period “D”?

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Poll Results

100%[A] Contraction of the diaphragm muscles ( 2 voters )
0%[B] Decrease in the volume of the lungs
0%[C] Movement of ribs downward and inward
0%[D] Relaxation of the external intercostal muscles
Based On 2 Votes

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As the volume increases, (as shown by the part ‘X’ of the graph), causing inspiration and it will cause the air from outside to rush inside the lungs.
Increasing the volume of lungs, happens when Contraction of the diaphragm muscles make it flat and contraction of the external intercostal muscles causes upward and outward movement of ribcage.

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    1 Answer

    1. [A] Contraction of the diaphragm muscles

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