Question

Pseudostratified columnar epithelium lines are present in which of the following?
(A) Vas deferens
(B) Buccal Cavity
(C) Bowman’s capsule
(D) All of the above

Answer 1

Hint: Pseudostratified columnar epithelia are tissues formed by one layer of cells that give the appearance of being made up of multiple layers, especially when seen in cross section. The nuclei of those epithelial cells are at different levels resulting in the illusion of being stratified. But the cells do not share a common apical surface, each cell is in contact with the basement membrane. They can be ciliated or not ciliated in nature.

Complete answer:
Option A (Vas deferens): The ductus deferens is lined by a pseudostratified columnar epithelium composed of columnar cells and basal cells. The luminal surface of the columnar epithelial cell is lined by stereocilia.
So, option A is correct.
Option B (Buccal cavity): non-keratinized surfaces like cornea or conjunctiva of the eye, mouth, oesophagus, anal canal, vagina and internal portion of lips is formed from stratified squamous epithelium tissue and must be kept moist by bodily secretions to stop them from drying out.
So, option B isn't correct.
Option C (Bowman’s capsule): The parietal epithelium of Bowman's capsule is the outer layer and consists of simple squamous epithelial cells called “parietal cells.”
So, option C isn't correct.
Option D (All of the above): this option can't be correct because altogether the above three options the kinds of cells are different.
So, option D isn't correct.

So, option A is correct.

Note:
This tissue is found in regions where there's a requirement to secrete mucus to trap foreign bodies and sweep those particles away through the coordinated action of cilia. Additionally, they're also seen in locations where the epithelia have a combined secretory and absorptive function, like within the ductus deferens and epididymis. It is rare to find the pseudostratified epithelium from the cuboidal or squamous type. So, the columnar pseudostratified epithelium is most common.