I. Intra-pulmonary pressure remains less than | vedclass

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(C) The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere.Inspiration occu

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Both $I$ and $II$

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(C) The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere.Inspiration occurs when the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure.This condition is equivalent to saying that there is a negative pressure in the lungs with respect to the atmospheric pressure.Therefore,both statements $I$ and $II$ describe the same physical condition required for inspiration to occur.Thus,inspiration takes place in both situations.

$I.$ Intra-pulmonary pressure remains less than the atmospheric pressure.
$II.$ There is negative pressure in the lungs compared to the atmospheric pressure.
In which of the above two situations does inspiration take place? Choose the correct option.

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$I.$ Intra-pulmonary pressure remains less than the atmospheric pressure.$II.$ There is negative pressure in the lungs compared to the atmospheric pressure.In which of the above two situations does inspiration take place? Choose the correct option.