Question Detail

ZOO 101 Gas Exchange and Respiration in Mammals Objective Question

Question

How thick are the walls of the alveoli?
Options
A Two cells thick
B Several layers thick
C One cell thick
Correct Answer
D Variable thickness
Correct Answer

Option C is the correct answer.

Detailed Explanation

Alveolar walls are just one cell thick, which minimizes the diffusion distance for gases.

Hint

This thinness allows for rapid gas exchange.

Question Info