Question

Simple cuboidal epithelium lines all the following structures except the
(a)Ovary
(b)Pancreatic ducts
(c)Thyroid follicles
(d)Fallopian tube

Answer 1

Hint Simple cuboidal epithelium provides some protection and function in absorption and secretion. They are also involved in active (pumping material in or out of the lumen) or passive mechanisms, depending on the location and cellular specialization.

Complete answer:
The simple cuboidal epithelium consists of a single layer of epithelial cells that appear to be square-shaped in cross-section. It contains large, rounded, centrally located nuclei, and all the cells of this epithelium are directly attached to the basement membrane.
The main functions of simple cuboidal epithelium include secretion, absorption, and excretion and therefore often provide protection via active or passive mechanisms depending on the physiological location and cellular specialization. Due to their specific functions, simple cuboidal epithelium often differentiates to form secretory or ductal portions of glands.

Additional information:
-In the thyroid, simple cuboidal epithelium cells line the thyroid follicles and are called follicular cells. They actively take up iodine and create thyroid hormone precursors, which are then processed and secreted into the blood.
-In the ovary, the cuboidal epithelial cells play a major role in repairing the damage caused during ovulation.
-The smaller pancreatic ducts have a cuboidal epithelium, while a columnar epithelium lines the larger ducts.
-The fallopian tube mucosal layer is composed of simple columnar epithelium. In addition to this, it also has cilia, which provides the necessary environment for fertilization of the egg cell.

So, the correct answer is ‘fallopian tube’.

Notes: There are three main shapes of epithelial cells namely: squamous, columnar, and cuboidal. These can be arranged in a monolayer of cells as simple epithelium, either squamous, columnar, or cuboidal, or in two layers or more cells deep as stratified (layered), or compound, either squamous, columnar or cuboidal.