Question

During inspiration air passes into lungs due to:
a)increased volume of thoracic cavity
b)fall in pressure inside the lungs
c) increase in the volume of thoracic cavity and fall in lung pressure
d)muscular expansion of lungs
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Answer 1

Answer:

here is your answer :

Due to this increase in volume, the pressure is decreased, based on the principles of Boyle's Law. This decrease of pressure in the thoracic cavity relative to the environment makes the cavity pressure less than the atmospheric pressure.

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Answer 2

Answer:

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Explanation:

Option (c)

Increase in volume of thoracic cavity and fall in lung pressure

Inspiration leads to increase in the volume of the lungs which is caused due to contraction of the diaphragm. The intercoastal muscles lift the ribcage. During inspiration, air flows into the alveoli because atmospheric pressure is greater than alveolar pressure. Increasing thoracic volume results in decreased pleural pressure. Increased alveolar volume, decreases alveolar pressure. Thus air moves into the lungs.