Asked Feb 10, 2019

How do we divide covering and lining epithelial tissue in two groups?


Expert Answer

Step 1

Ther are four types of tissues:

  1. Connective tissue
  2. Muscular tissue
  3. Nervous tissue
  4. Epithelial tissue

Epithelial tissue serves to cover and line the organs and whole of the organism from outside world. It acts as a barrier. For example skin separates the organism from its surroundings.

Step 2

Epithelial tissue has various functions. These include: Protection, Reducing friction, Cleaning, Respiration etc.

It covers almost all the internal as well as external surfaces of the body. It present above an organ or tissue and is separated from that organ/tissue by a layer of connective tissue termed as basement membrane.

Epithelial tissue is classified on the basis of layers of cells present between its surface and basement membrane into two groups:

  1. Simple epithelium : It consists of single layer of cells.
  2. Stratified or compound epithelium : It consists of two or more layers of cells.


Step 3

These two classes differ as follows:


Simple epithelium

Stratified epithelium


It is composed of single layer of cells

It is composed of multiple layers of cells


All the cells touch basement memberane

Only the cells of lowermost layer touch basement membrane


It is further classified as squamous, columnar and cuboidal on the basis of cells that constitute it.

It is further classified as squamous, columnar, keratinized, transitional and cuboidal on the basis of cells that constitute it


It does not offers protection

It offers protection to underlying tissue


It is pre...

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