Question

Lining of kidney tubules is made up of
A) Columnar epithelium
B) Cuboidal epithelium
C) Squamous epithelium
D) Pseudostratified epithelium

Answer 1

Hint:Epithelium or the epithelial tissue are the simplest protective tissue. They form the lining of cavities and the hollow organs within the body.

Complete answer:
Kidney tubules are an important component of an organism's blood clearance mechanism by recovering the needed metabolites from glomerular filtration by active transport. Tubules are prone to injury generally as the result of ischemia reperfusion actions that damage the polarized tubular cell layer which coats the tubule basement membrane and it causes the dysfunction and necrosis that is frequently connected with acute renal failure. On the other hand tubules are able to self‐repair and form new proximal tubular cells to replace failing or necrotic cells.
Lining of kidney tubules is made up of cuboidal epithelium. It is composed of a single layer of cube-like cells which have large spherical shaped nuclei in them. The cells in the kidney tubules help in the transport and absorption of the filtered substances. The cuboidal epithelium is usually found in salivary glands, thyroid glands and the sweat glands. Their main function is to help in the absorption ,secretion and excretion. Kidney tubules are lined by the cuboidal epithelium.

The main function of cuboidal tissue are include the following
i) It provides a coating of protection from abrasion, invading bacteria, the foreign bodies and too much water loss due to its selective permeability .
ii) It will do the function of ion exchange by absorbing ions such as sodium and potassium from blood and helps in transporting them to other parts of the kidney.
iii) It helps in controlling the ion absorption from the blood.

Thus the correct answer is option (D) cuboidal epithelium.

Note:The important property of the cuboidal epithelium is the secretion and absorption. This kind of epithelial cells are also found in the small collecting ducts of the kidneys, pancreas, and also in the salivary glands. And also they are generally found in the areas with high metabolic activity.