Epithelial tissue is one of the important body tissues, so what do you know about it? Here is this article to learn about the most important information that interests you about epithelial tissue. The epithelial tissue, or the so-called epithelial tissue, is one of the basic tissues in the body that forms the covering of all surfaces of the body. In this article, let''s learn about the most important information that you should know about these epithelial tissues:

epithelial tissue

Epithelial tissues are tissues that cover all surfaces of the body and line the cavities. They are also the primary tissue in glands. It should be noted that the cells of the epithelial tissues are connected in a strong and regular manner. The shape and size of epithelial tissues also depend on their function, as the shapes and sizes of these tissues vary. They appear in different shapes, including: long columnar, scaly, or cubic.

Types of epithelial tissue

Epithelial tissues are classified according to their function in a specific location. Epithelial tissues can also be classified according to the number of tissue layers, as they include the following:

Simple epithelia: made up of a single layer of cells.

Stratified epithelia: Consists of two or more layers of cells.

It is also classified according to the shape of the cells into three types, which include the following:

1. Squamous epithelial tissue

The cells in this tissue are very thin, resembling fish scales. Simple squamous tissue is often found in the lungs, the lining of the heart, and blood vessels, where it helps in the transport process. As for the complex type, it is found in the vagina, esophagus, and mouth, which plays an important role in protection. .

2. Columnar epithelial tissue

The cells of this tissue are columnar in shape and participate in the absorption of substances. Simple columnar tissue is often found in the alimentary canal, uterus, and others to assist in the absorption process. As for the complex, it is found in the ducts of some glands, and the rectum in males for the purpose of secretion and protection.

3. Cuboidal epithelial tissue

Its cells appear square in shape when viewed from a cross section. Simple cubic tissue is often found in the tubules of the kidneys, and some gland ducts, as it plays an important role in secretion and absorption. Complex cubic epithelial tissue is also found in the glands responsible for sweating and salivary glands for the purpose of protection.

Epithelial tissue functions

Epithelial tissue functions include the following

1. Protection

The function of the epithelial tissue is to protect the underlying tissues of the body from trauma, radiation, toxins, and dehydration to which they may be exposed and lead to damage.

2. Transportation

The epithelium contains pumps that help transport different molecules into and out of the cell, as it allows the exchange of molecules between the underlying cells, capillaries, body cavity, and ducts.

3. Excretion

The function of the epithelium is seen in the secretions. The secretions of sweat, mucus, enzymes, and other products are delivered by channels of the epithelium.

4. Absorption

The formation of the epithelium of cilia and others on the surface of the cells contributes to an increase in the surface area, which leads to the absorption of many molecules of substances, and helps the cells of the columnar epithelium in the digestive tract to absorb water and many nutrients in the small intestine.

5. Reception

The function of some epithelial cells is based on the performance of sensory functions, by receiving sensory information and converting it into nerve signals.

Epithelial tissue diseases and disorders

Common skin diseases are due to disorders of the epithelial tissue, as these disorders include the following:

Acne.

Contact dermatitis.

Psoriasis.

Sunburn.

Sweating disorders.

Atopic eczema.

Impetigo.