Question

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because
(1) there is a negative pressure in the lungs
(2) there is a negative intrapleural pressure pulling at the lung walls
(3) there is a positive intrapleural pressure
(4) pressure in the lungs is higher than the atmospheric pressure

Answer 1

Answer:

2

Explanation:

because there is a negative intrapleural pressure pulling at the lung walls adjacent lung alveoli. It generally occurs due to chronic cigarette smoking.

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