The respiratory membrane of the gas exchange surfaces consis

The respiratory membrane of the gas exchange surfaces consists of A) pseudostratified ciliated columnar epithelium. B) moist cuboidal epithelium. C) simple squamous epithelium. D) ciliated squamous epithelium. E) surfactant cells.

Solution

13)Answer (A)Pseudo stratified ciliated coloumnar epithelium.

Pseudostratified Columnar Epithelium

A pseudostratified columnar epithelium is a special type of simple epithelium that consists of a falsely-stratified single layer of epithelial cells resting on a basement membrane. Many, if not most, of the cells, are columnar. The single layer of cells appears stratified because the cells have different heights: all the cells rest on the basement membrane, but all do not reach the apical surface. Therefore, the nuclei, which are typically the most visible cellular feature, are widely staggered, giving the superficial appearance of stratification. Two major subtypes of pseudostratified columnar epithelia are found in the animal body: