Question

The respiratory membrane consists of _____.

a. a single thickness of epithelial cells, but not the basement membrane.
b. a single thickness of epithelial cells and the basement membrane. c. two thicknesses of epithelial cells, but not their basement membranes.
d. two thicknesses of epithelial cells and their basement membranes. e. a single thickness of the basement membrane.

Answer 1

Answer:

d. two thicknesses of epithelial cells and their basement membranes

Explanation:

The gas exchange occurs across the respiratory membrane, this membrane is composed of type I cells (squamous epithelial cells, thin, gas exchange occurs here) and type II cells (cuboidal epithelial cells, secrete surfactant to mantain the alveolli's shape) and a their epithelial basement membrane.

Considering this information we can conclude that the correct answer is d. two thicknesses of epithelial cells and their basement membranes

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