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Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when

(A) Intrapulmonary pressure is less than the atmospheric pressure

(B) Intrapulmonary pressure is greater than the atmospheric pressure

(C) Intrapulmonary pressure is equal to the atmospheric pressure

(D) Intrapleural pressure becomes more than the intra-alveolar pressure

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Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when intrapulmonary pressure is less than the atmospheric pressure.

So, The correct option is (A).

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