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Identify the process X shown in the give...

Identify the process X shown in the given figure and select the correct statement regarding it.

A

During process X, air rushes out from the lungs.

B

During process X, volume of thoracic cavity decreases.

C

During process X, air pressure in the lungs decreases.

D

During process X, the diaphragm muscles relax.

Text Solution

Verified by Experts

The correct Answer is:
C
The process X in the given figure shows inhalation . During inhalation , diaphragm muscles contract and become flat . At the same time, intercostal muscles contract to pull the ribs upwards and outwards . This increases the volume of thoracic cavity. The lungs being elastic also increase in size and the air pressure in the lungs decreases . Air from the atmosphere having higher pressure rushes into lungs through nostrils and the lungs get filled with fresh air.
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