Answer:

Epithelial tissue is one of the four main types of body tissue found in your organs and covers internal and external surfaces in your body.

Types of Epithelial tissue :-

Different types of epithelial cells based on shape include:

1. Squamous Epithelium
2. Cuboidal Epithelium
3. Columnar Epithelium

Types of epithelial cells based on their arrangement include:

1. Simple
2. Stratified
3. Pseudostratified

Given the different shapes and types of layers of epithelial cells, there can be several types of epithelial tissue, including:

1. Simple squamous epithelium
2. Simple columnar epithelium
3. Stratified squamous epithelium
4. Stratified cuboidal epithelium
5. Stratified columnar epithelium
6. Pseudostratified columnar epithelium

Epithelial cells can also be categorized by the special functions they have, including:

1. Transitional epithelium
2. Glandular epithelium
3. Olfactory epithelium

Functions

Epithelial tissue can have one or a combination of the following several functions:

1. Protection
2. Secretion
3. Absorption
4. Excretion
5. Filtration
6. Diffusion
7. Sensory reception

Verified answer

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Epithelial tissue

• Epithelial tissue or epithelium forms the outer covering of the skin and also lines the body cavity. It forms the lining of respiratory, digestive, reproductive and excretory tracts. They perform various functions such as absorption, protection, sensation and secretion.

Functions

• Protection: As it covers the entire body surface, it is the first line of defence against any kind of mechanical injury, chemical exposure, excessive fluid loss and infections. Ciliary projections present in the nose or upper respiratory tract, trap the dust particles and prevent it from entering the body

• Absorption: The epithelial lining of the digestive tract absorbs water and nutrients

• Exchange of substances: Epithelial tissue regulates the exchange of substances between body and external environment as well as the internal exchange between different parts of the body. Everything that enters the body or enters the bloodstream by absorption has to cross the epithelial barrier

• Sensation: Sensory receptors are present in the epithelial tissue of the nose, eyes and ears, taste bud, etc. that help in transmitting signals from the external stimuli to the brain

• Secretion: Various glands made up of epithelial cells secrete hormones, enzymes, saliva, mucus, sweat, etc.

Types

There are three types of epithelial cells, which differ in their shape and function.

• Squamous Epithelium – They are thin and flat cells

• Cuboidal Epithelium – They are short cylindrical cells, which appear hexagonal in cross-section

• Columnar Epithelium – They are long or column-like cylindrical cells, which have nucleus present at the base.