Question

Inner lining of gut, stomach and liver is made up of
A. Simple squamous
B. simple cuboidal
C. Simple columnar
D. Pseudo stratified epithelium.

Answer 1

Hint: The inner lining of organs like gut, stomach, intestine and liver are usually secretory in nature; they secretes different kinds of juice or enzyme which are necessary for the digestion and other purposes of such organs.

Complete answer:
The simple columnar epithelium cells are elongated and placed side by side like columns. Nucleus is elongated and some of these cells contain mucus that are known as goblet cells, intestinal mucosa bear microvilli to absorb the food. This simple columnar epithelium functions as protection, secretion and absorption.
A. Simple squamous epithelium:- it is the pavement of basement membrane, composed of large flat cells and their edges fit together like tiles, at the surface it appears as polygonal in shape. They are usually found in terminal bronchioles and alveoli, wall of bowman capsule. Its function as protection, excretion and gas exchange.
B. Simple cuboidal epithelium :- These cells are cuboidal in shape, on the surface it appears as polygonal, nuclei are rounded and present in the center of the cell, these cells often form microvilli on the free surface. In gonads it is called as germinal epithelium due to production of gametes, these are found in salivary gland and pancreatic ducts, kidney, ovary, testes. It functions as protection, absorption, gamete formation and secretion.
D. Pseudo stratified epithelium:- these are columnar and unequal in size, long and free from the surface, short cell cover by long cell which bear oval nuclei, it appears as multilayered but it is one cell thick. It is of two types, columnar and columnar ciliated. They function as protection, secretion, movement of secretion from the glands.

Hence, the correct answer is C.

Note: Simple columnar epithelium is only found in gut associated organs like liver, stomach, intestine because they are secretory and absorptive in nature which is the important feature of gut associated organs.