The epithelium is one kind of body tissue covering all interiors and exterior body surfaces. It also coats body cavities and organs. In addition, it seems to be the primary tissue in glands. Safeguarding, absorbing, and secretion are all roles of epithelial tissue, based on where it’s placed in the human system. Our body’s components comprise four main types of tissues: epithelial, muscular, connective, and nervous. All materials entering or leaving an organ would first pass through epithelial tissue. An example of epithelial tissue shall be found in humans since the body comprises several distinct types of epithelial tissue. 

Epithelial Cells: A Brief

Epithelial cells are responsible for epithelial tissue formation. Based on where they are present in the human system and what tasks they perform, the cells might have varied forms and be structured in a single layer or numerous layers.

A cell is indeed the smallest unit in biology. It seems to exist on its own. All living creatures and tissues in the human system are composed of cells. A cell shall consist of three essential components: nucleus, cell membrane and cytoplasm. 

Examples of Epithelial Tissue

The following are just examples of epithelial tissue:

• The lining of our intestines made up of bacteria
• The epidermis or the outermost layer of human skin
• The sweat glands in our bodies
• The lining of the abdominal cavity and respiratory tract

What is not an example of Epithelial Tissue?

The following are not examples of epithelial tissue. They are:

• Blood vessel
• Skull
• Cartilage and bone

Types of Epithelial Tissue examples

Epithelial cells come in various shapes and sizes as epithelial tissues provide a variety of roles based on their location in the human system.

Shape-Based

The following are several types of  shape-based epithelial cells:

• Columnar epithelium: These epithelial cells are higher than broader, giving them a column-like impression.
• Cuboidal epithelium: Such epithelial cells get the shape of a cube with equal depth, width, and height.
• Squamous epithelium: The cells of the squamous epithelium resemble flat and sheet-like structures.

Arrangement-Based

The arrangement of the cells in epithelial tissue shall indeed change. The following are some descriptions or adjectives describing how the cells are grouped:

• Simple: There will only be a single epithelium in a primary epithelium.
• Stratified: The epidermis of such epithelial cells is constructed of many layers of cells.
• Pseudostratified: They are composed of tightly packed cells that seem to be stacked in layers due to their varied sizes, yet there is only one epithelium.

Types of epithelial tissue examples in the human system

There are various varieties of epithelial tissue based on the diverse formats of epithelial cell sheets, such as:

• Simple cuboidal epithelium: It is present in epithelial or secreting tissues and kidney capillaries.
• Simple columnar epithelium: Such form of the epithelium has terminal microvilli or cilia and is typically specialised for absorption. Both guts and stomach are lined by these cells.
• Pseudostratified columnar epithelium: Such a form of epidermal layer lines your respiratory tract and is characterised by a large number of cilia.
• Simple squamous epithelium: Such a form of epithelium coats blood arteries and bodily cavities, regulating chemical entry into the surrounding tissues.
• Stratified squamous epithelium: Such form of epithelium generally has protective mechanisms, such as protecting the lining from germs and preventing water loss. The epidermis (outermost part) of human skin is formed of stratified squamous epithelial cells.
• Stratified cuboidal epithelium: Such form of epithelium is less prevalent and can be present in the sweat and salivary glands’ excretory ducts.
• Stratified columnar epithelium: Such form of epithelium is less prevalent and may be found in the mucous membrane that lines your eyelids, serving as a defensive and mucus-secreting barrier.

Purposes/Significance of Epithelial Tissues

Epithelial tissue serves a variety of vital processes in the human body. Because epithelial cells are present all over our system, their primary goal varies depending on where they are. The tasks of epithelial tissue shall always be one or a mixture of the following:

• Protection
• Filtration
• Secretion
• Excretion
• Absorption
• Diffusion
• Sensory reception

Conclusion

Epithelial cells are responsible for epithelial tissue formation. Epithelial tissue seems to be a layer of densely populated cells that make up the body’s surfaces. The skin is the most remarkable example of epithelial tissue (as well as the broadest organ in the human system). Epithelial cells come in various shapes and sizes as epithelial tissues provide a variety of roles based on their location in the human system. Epithelial tissue serves a variety of vital processes in the human body, such as protection, diffusion, filtration, absorption, sensory reception, excretion and secretion.