The patency of small airways is maintained by which of the following mechanisms?
I.cartilaginous support
II.traction of surrounding elastic tissue
III.transmural pressure gradients

Question

Quizplus · Accepted Answer

Small airways lack cartilaginous support but are maintained by the traction of surrounding elastic tissue and transmural pressure gradients. Choice A is incorrect because cartilaginous support is not present in small airways. Choice B is incorrect because although the traction of surrounding elastic tissue helps maintain patency, it is not the only mechanism involved. Choice D is incorrect because although all three mechanisms listed are involved in maintaining patency of small airways, cartilaginous support is not present in small airways.

The Patency of Small Airways Is Maintained by Which of the Following