Explain the structure and function of epithelial tissue.

1.	Explain the structure and function of epithelial tissue.
Answer» Epithelial Tissue : 1. Simple epithelium: is composed of a single layer of cells resting on abasement membrane. 2. Compound epithelium: consists of two or more cell layers and has protective function. Simple: • Composed of single layer of cells. • Functions as lining for body cavities, ducts and tubes. 1. Squamous • single thin layer of flattened cells. • found in walls of blood vessels, air sacs of lungs for diffusion. 2. Cuboidal • single layer of cube like cells. • found in ducts of glands and tubular parts of nephron for secretion and absorption. 3. Columnar • single layer of tall and slender cells. • free surface may have microvilli. • found in lining of stomach and intestine for secretion and absorption. 4. Ciliated • columnar or cuboidal cells with cilia. • move particles or mucus in specific direction, in bronchioles, fallopian tubes.

Answer»

Epithelial Tissue :

1. Simple epithelium: is composed of a single layer of cells resting on abasement membrane.

2. Compound epithelium: consists of two or more cell layers and has protective function. Simple:

• Composed of single layer of cells.

• Functions as lining for body cavities, ducts and tubes.

1. Squamous

• single thin layer of flattened cells.

• found in walls of blood vessels, air sacs of lungs for diffusion.

2. Cuboidal

• single layer of cube like cells.

• found in ducts of glands and tubular parts of nephron for secretion and absorption.

3. Columnar

• single layer of tall and slender cells.

• free surface may have microvilli.

• found in lining of stomach and intestine for secretion and absorption.

4. Ciliated

• columnar or cuboidal cells with cilia.

• move particles or mucus in specific direction, in bronchioles, fallopian tubes.

Discussion