Question

how do i remember which epithelial tissue is located where ? simple mugging doesnt work i tend to forget it, can you please explain why which epithelial tissue is present at that particular point, i know some general info is available in video and in textbook but it doesnt address more clearly like both columnar and cuboidal do secretion and absorption so how to distinguish between their location?

Answer 1

Lining of the small intestine – Columnar epithelium

The lining of the kidney tubules – Cuboidal epithelium

Lining of blood vessels – Squamous epithelium

Respiratory tract – Ciliated Epithelium


Squamous Epithelium – These are thin, flat cells that are closely packed. The squamous epithelial cells line the cavities of the mouth, oesophagus, alveoli, and blood vessels. This tissue gives protection against mechanical injury and also blocks the entry of germs. If the squamous epithelium is arranged in many layers, it is a compound squamous tissue called the stratified squamous epithelium. We find these kinds of tissues in the skin and also the lining of the oesophagus.

Cuboidal Epithelium – These cells are cuboidal in shape. They are found in the salivary glands, kidney tubules, sweat glands etc. Their main function includes absorption, secretion, and excretion. If the cuboidal epithelium is arranged in many layers it forms the stratified cuboidal epithelium. It is found on the inner side of the pancreatic ducts and salivary glands. They mainly help in protection.

Columnar Epithelium – The columnar epithelium has cells that are pillar-like and column-like. We can find them in the lining of the stomach and intestine. Its functions include absorption and secretion.

Ciliated Epithelium – When the columnar epithelial tissues have cilia, then they are ciliated epithelium. They are present in the lining of the trachea, kidney tubules etc. The rhythmic movement of the cilia helps in the movement of material in one direction.

Glandular Epithelium – These are modified columnar epithelial tissues. They are large cells that present in the tear glands, sweat glands etc. Their main function is secretion.