Question

Describe the structure and function of different types of epithelial tissues. Draw a diagram of each type of epithelial tissue.

Answer 1

Epithelial tissue:

1. Most organs and cavities in the body are lined by epithelial cells, which are thin protective coatings.
2. It also acts as a barrier, separating the various body systems.
3. Epithelial tissue makes up the skin, the lining of the mouth, the lining of blood vessels, lung alveoli, and kidney tubules.
4. Epithelial tissue cells create a continuous layer that is closely packed.

Types of epithelial tissue:

a) Squamous epithelial tissue:

1. Transportation of substances happens through a selectively permeable surface in cells lining blood arteries or lung alveoli, this epithelium is a flat type of epithelium.
2. The simple squamous epithelium is the name for this type of epithelium.

b) Stratified squamous epithelium:

1. To reduce wear and tear, skin epithelial cells are organised in numerous layers.
2. This epithelium is made up of layers that are arranged in a pattern called Stratified squamous epithelium.

c) Columnar epithelium:

1. These tall epithelial cells are present where absorption and secretion occur, such as in the inner lining of the intestine.
2. Movement through the epithelial barrier is facilitated by this columnar epithelial.

d) Cuboidal epithelium:

1. This is the lining of kidney tubules and salivary gland ducts, and it provides mechanical support.
2. A multicellular gland can form when a piece of the epithelial tissue folds inward.
3. The glandular epithelium is the glandular epithelium.

Diagram: