Question

Pseudostratified columnar epithelium is found in
A. Wall of cloaca
B. Male Urethra
C. Oviduct
D. Oesophagus

Answer 1

Hint: Pseudostratified columnar epithelium are tissues formed by a single layer of the cell, and have it's cell nuclei. Although it's a single layer, it looks multi-layered, when seen from the cross-section. These are most commonly found in the respiratory airways of the nasal cavity.

Complete answer:
A special kind of columnar epithelium composed of a single layer of columnar epithelial cells, which because of positioning and nuclei disposed at completely different levels seems stratified. These tissues may be classified as ciliated and nonciliated based on a cellular organelle involved with motility and sensory activity. Ciliation is another specialization of epithelial cells or animal tissue. Cilia exhibits a beating pattern which moves fluid and suspended matter in one direction which is along the epithelium. The pseudostratified epithelium is largely found within the line of trachea, male urethra, bronchi, and few other places.
The wall of the cloaca is lined by endoderm. The urethra is lined by ciliated columnar or perhaps ciliated cuboidal. And the Oesophagus is lined by stratified squamous epithelium.

Hence the right answer to this question is B (Male Urethra).

Additional Information: Cells of this tissue are all of the various heights – which means not every cell has an apical surface or a surface that makes direct contact with the lumen. Lumen is the interior cavity of the organ or structure. They do each have a basal side, which makes direct contact with the connective or muscular layer of tissue present below it. It is this basal side that differentiates pseudostratified tissue from stratified tissue, where only the lowest layer of cells touches the underlying tissue. The pseudostratified columnar epithelium is a falsely striated tissue composed of columnar-shaped cells that line an organ or cavity space.

Note:
Both simple and pseudostratified columnar epithelia are heterogeneous epithelia because they include additional types of cells interspersed among the epithelial cells. These epithelia have special cells called Goblet Cells. Goblet cell is a mucous-releasing unicellular gland interspersed between the columnar epithelial cells of a mucous membrane.