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Question

Which of the following cells are known as brush-bordered epithelium?

A
Pseudostratified epithelium
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B
Columnar epithelium
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C
Glandular epithelium
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D
Squamous epithelium
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Solution

The correct option is B Columnar epithelium
Columnar epithelium appears column like in vertical section. Their nucleus is located near the base. They participate in secretion, absorption and excretion. They are found in the inner lining of the small intestine. Microvilli are present on the apical surface which increase the surface area for absorption.

Squamous epithelium is a single layer of thin flattened cells with irregular boundaries. They are also known as tessellated epithelium or pavement epithelium. They are found in alveoli, lymph vessels and blood vessels (endothelium), endocardium of heart, lining of the Bowman’s capsule. They form a diffusion boundary.

Pseudostratified epithelium are single layered but appear to be double layered. This is due to the different size of cells. The nuclei also lie at different levels. They can be ciliated or non ciliated. Ciliated epithelium is found in the trachea. Non-ciliated are found in the auditory tube.

Glandular epithelium are specialised cuboidal or columnar cells for secretion. They can be unicellular or muticellular. Goblet cells of alimentary canal consist of isolated glandular cells. Salivary glands consists of cluster of cells.

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