Question

Pseudostratified epithelium is found in
a) Kidney
b) Trachea
c) Testis
d) Epidermis

Answer 1

Hint: Epithelium layer is the thin, continuous layer of cells that are used for the protection. They are tightly connected to each other. They are of different types namely, simple squamous epithelium, simple cuboidal epithelium, simple columnar epithelium, pseudostratified columnar epithelium, stratified squamous epithelium, stratified cuboidal epithelium, stratified columnar epithelium, and transitional epithelium.

Complete answer:
Pseudostratified epithelium layer is composed of the columnar epithelium cells which have nuclei present on different heights. They give an appearance like that of the stratified epithelium. They have hair-like extensions present on them which are known as the cilia. The cilia usually increase the surface area and help in the smooth motion of the particles passing through them. They are also involved in the secretion of the mucous. They are mostly found in the lining of the upper respiratory tract, trachea and are also present in the fallopian tubes to help in the movement of the ova.

Additional information: Simple squamous epithelium is present in the air sacs of the lungs and is also present in the lining of the heart, blood vessels, and the lymphatic vessels. Their main function involves the diffusion and the filtration. Simple cuboidal epithelium is present in the ducts of the small glands and helps in the secretion and absorption. The simple columnar epithelium is present in the bronchus, uterine tubes, and uterus, and their function is absorption. Stratified squamous epithelium is present in the esophagus, mouth, and vagina and helps in the protection. The stratified columnar epithelium is present in the male urethra and helps in the secretion and protection.

So, the answer is ‘trachea’.

Note: The presence of the epithelium layer in various organs and ducts helps in releasing their secretions and also helps in their protection. They are divided according to their shapes as squamous, cuboidal, and columnar.