If the thoracic wall is punctured,air leaking in will cause the lung to collapse.Thus one can conclude that in the normal intact thoracic cavity,

Question

Quizplus · Accepted Answer

In the normal intact thoracic cavity, the air pressure inside the lungs is lower than it is on the outside. This negative pressure helps keep the lungs inflated, and breathing movements further aid in lung expansion. If the thoracic wall is punctured, air can leak in and disrupt this negative pressure, causing the lung to collapse. Choice A is incorrect because lung expansion is an active process that involves the contraction of the diaphragm and intercostal muscles. Choice B is incorrect because the air pressure inside the lungs is actually lower than the pressure outside the body. Choice D is partially correct because breathing movements aid in lung expansion, but the negative pressure inside the thoracic cavity is the primary factor that helps keep the lungs inflated.

If the Thoracic Wall Is Punctured,air Leaking in Will Cause