In reference to a normally expanded lung,the
A)intrapulmonic pressure is less than intrapleural pressure.
B)intrapleural pressure is greater than atmospheric pressure.
C)intrapulmonic pressure is greater than intrapleural pressure.
D)intrapleural,intrapulmonic,and atmospheric pressures are equal.

Question

Quizplus · Accepted Answer

In a normally expanded lung, the intrapulmonic pressure (pressure inside the lung) is greater than the intrapleural pressure (pressure outside the lung but inside the thoracic cavity). This pressure difference keeps the lungs inflated and prevents them from collapsing.  Additionally, the intrapleural pressure is slightly negative compared to atmospheric pressure (which is considered 0), allowing the lungs to expand during inhalation. Therefore, choice C is the best answer.

In Reference to a Normally Expanded Lung,the