Types and Functions of Epithelial Tissue that You Need to Know

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Types and Functions of Epithelial Tissue that You Need to Know
Types and Functions of Epithelial Tissue that You Need to Know
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Epithelial tissue is one of the main tissues that is widely distributed throughout the body and covers the outside and inside of the body. This network consists of several types and each type has a different function, depending on the network is located

Epithelial tissue lines the outer skin and hollow organs, such as the lining of the intestines, walls of blood vessels, respiratory tract, abdominal cavity, and sweat glands. Anatomically, epithelial tissue has three main forms, namely flat (squamous), cylindrical (columnar), and cube (cuboid).

Types and Functions of Epithelial Tissue that You Need to Know - Alodokter

Types of Epithelial Tissue

There are epithelial tissues that consist of only one layer, but some are multi-layered or pseudostratified. The following are some types of epithelial tissue in the body:

Squamous epithelial tissue

Squamous epithelial tissue is flat and looks like a sheet. This tissue lines the blood vessels and body cavities. Simple squamous epithelial tissue serves to regulate the passage of substances into the tissue beneath the epithelium.

Meanwhile, stratified squamous epithelial tissue has a protective role and can be found in the outer layer of the skin or the epidermis and cornea of ​​the eye.

Cuboid-shaped epithelial tissue

The cuboidal epithelial tissue has the same width, height and depth. Simple cuboidal epithelial tissue is usually found in glandular tissue and renal tubules, while stratified cuboidal tissue can be found in the excretory ducts of the salivary and sweat glands.

Columnar epithelial tissue

Columnar epithelial tissue looks like a column that is taller than it is wide. Simple columnar epithelial tissue has an absorption function so that it is generally located in the intestinal cavity.

Meanwhile, stratified columnar epithelial tissue serves as a protector and mucus-producing. This type of tissue can be seen in the conjunctiva that lines the ball and the inner eyelid.

In addition, there is also a pseudo-layered columnar epithelial tissue. This type of epithelium consists of cells that are tightly packed together, have different sizes, and appear multi-layered even though there is actually only one layer of cells.

Pseudo-coated columnar epithelium functions to expedite the process of secretion and movement of mucus in body organs. This tissue can be found in the upper respiratory tract.

Various Functions of Epithelial Tissue

Epithelial tissue has various important functions for the body, such as the function of protection, absorption, and excretion of substances. Since this tissue can be found throughout the body, its function and purpose vary depending on the location.

The following are some of the functions of epithelial tissue in the body:

1. Protection function

This function means protecting another tissue or organ function itself. For example, epithelial tissue in the skin serves to protect deeper underlying tissues, such as blood vessels and muscles. Meanwhile, the epithelial tissue that lines the intestines protects the body from bad bacteria in the intestines.

2. Secretion function

Secretion itself means producing a substance that will be reused by the body to carry out certain functions. An example is the epithelial tissue in the body's glands that function to secrete enzymes or hormones.

3. Excretion function

The excretory function of epithelial tissue plays a role in removing waste or metabolic waste from the body. This type of epithelial tissue is usually found in the kidneys and sweat glands.

4. Absorption function

Epithelial tissue in certain organs also plays a role in the process of absorption of important substances for the body. For example, the epithelial tissue in the intestines that can absorb nutrients from the food you eat.

5. Filter function

Filtration means to filter. This function is generally owned by epithelial tissue in the respiratory tract which is able to filter dirt and particles from the inhaled air and clean it. Meanwhile, the epithelial tissue in the kidney also has the same function, namely filtering blood.

6. Diffusion function

In biological terms, the term diffusion means the movement of liquids or particles from one place to another. Well, the function of diffusion in epithelial tissue is to support the process of absorption, filtering, and excretion by flowing fluids, hormones, or particles in the body.

7. Sensory reception function

Sensory nerve endings embedded in epithelial tissue make the body able to receive sensory stimuli from the outside. For example, the epithelial tissue in the ear is important for hearing and balance functions, while the epithelium in the tongue can assess the taste of food.

Well, those are the anatomical parts of epithelial tissue and their functions. Because epithelial tissue is one of the most important tissues in the body, you must always keep it in good working order. One way you can do this is to meet the body's fluid needs.

If not cared for properly, the body's epithelial tissue can experience various disorders or certain diseases, such as colitis, asthma, or skin diseases, such as warts.

In addition, epithelial tissue can also grow too fast beyond the normal limits of its growth. This condition can trigger cancer, such as cervical cancer, thyroid cancer, breast cancer, pancreatic cancer, and lung cancer.

The cause of cancer is not known for certain, but you can prevent it by adopting a he althy lifestyle and a balanced nutritious diet.

If you have complaints related to epithelial tissue, for example a lump on the skin or a lump in the body that is palpable from the outside, don't hesitate to consult a doctor so that the cause of the lump can be identified and treated appropriately.

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