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Unformatted text preview: ll. It must be negative to keep the lungs from collapsing. Pulmonary compliance decreases if there is not enough surfactant, meaning the lungs resist inflation more. The chest wall must pull more on the pleural cavity, creating a more negative intrapleural pressure (it decreases). Intrapulmonary pressure would remain constant. The difference between intrapulmonary and atmospheric pressure causes the pressure gradient that drives air into or out of the lungs. Because the airways remain the same, the pressure gradient driving flow remains the same. If it was assumed that alveoli collapsed and total lung volume decreased because of the lack of enough surfactant, intrapulmonary pressure would decrease (increased magnitude) to compensate....
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- Spring '10