Intrapleural pressure negative

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Q. Why is intrapleural pressure negative?

a) alveolar pressure negative

b) surfactant is equally distributed

c) lymphatic drainage

d) upper airway ring cartilage

ANSWER:

Ans: C
Causes of negativity of Intrapleural pressure
Lymphatic system drains the pleural fluid, generating a negative intra pleural pressure (- 2 mm Hg)
Elasticity of lungs causes them to assume smallest possible size. But opposing force – elasticity of the chest wall pulls the thorax outward to enlarge the lungs.

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