Question

Classify and describe epithelial tissue on the basis of structural modifications of cells.

Answer 1

There are two types of epithelial tissues namely simple epithelium and compound epithelium. Simple epithelium is composed of a single layer of cells and functions as a lining for body cavities, ducts, and tubes. The compound epithelium consists of two or more cell layers and has a protective function as it does in our skin. On the basis of structural modification of the cells, the simple epithelium is further divided into three types. These are (i) Squamous, (ii) Cuboidal and (iii) Columnar

• The squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries. They are found in the walls of blood vessels and air sacs of lungs and are involved in functions like forming a diffusion boundary. The cuboidal epithelium is composed of a single layer of cube-like cells. This is commonly found in ducts of glands and tubular parts of nephrons in kidneys and its main functions are secretion and absorption. The epithelium of the proximal convoluted tubule (PCT) of the nephron in the kidney has microvilli. The columnar epithelium is composed of a single layer of tall and slender cells. Their nuclei are located at the base. The free surface may have microvilli. They are found in the lining of stomach and intestine and help in secretion and absorption.
• The compound epithelium is made of more than one layer (multi-layered) of cells and thus has a limited role in secretion and absorption. Their main function is to provide protection against chemical and mechanical stresses. They cover the dry surface of the skin, the moist surface of the buccal cavity, pharynx, the inner lining of ducts of salivary glands and of pancreatic ducts.