MICROANATOMY

EPITHELIUM CONNECTIVE TISSUE SKIN

EPITHELIA GLANDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is a type of epithelial tissue which may just look stacked because of varying height and functions as a lining of respiratory tract?
A
Psuedostratified columnar
B
Simple squamous
C
Stratified cuboidal
D
Simple columnar
Explanation: 

Detailed explanation-1: -Respiratory epithelium is ciliated pseudostratified columnar epithelium found lining most of the respiratory tract; it is not present in the larynx or pharynx.

Detailed explanation-2: -Pseudostratified columnar epithelia are tissues formed by a single layer of cells that give the appearance of being made from multiple layers, especially when seen in cross section. The nuclei of these epithelial cells are at different levels leading to the illusion of being stratified.

Detailed explanation-3: -Columnar epithelial cells are taller than they are wide and function mostly in absorption, such as in the digestive tract. Pseudostratified columnar epithelia appear to be stratified because there seems to be more than one row of nuclei, but, in fact, it is a single layer of cells with the nuclei at different levels.

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