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Chapter: Biology: Animal Tissue, Organ and Organ System

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Structural Characteristics, Function and Location of Epithelial Tissue

Structural Characteristics, Function and Location of Epithelial Tissue
The cells of the epithelial tissue lie closely or side byside on a basement membrane.

Structural Characteristics, Function and Location of Epithelial Tissue:


Structural Characterisics : The cells of the epithelial tissue lie closely or side byside on a basement membrane. There is no matrix in this tissue. On the basis of cell size, location in the animal body and nature of work, this tissue is of three types, sch as;

 

a. Squamous Epithelial Tissue: Cells of this tissue are flat like scales; rnucleusis large (Fig- 5.1)

 

Example: Wall of the Bowman's capsule of Kindey.

Function: Mainly filtration and covering.

 

b. Cuboidal Epithelial Tissue: Cells of this tissue are cuboidal, as the length,breadth and height of the cells are nearly equal (Fig-5.2).

 

Example: Collecting tubules of the kidney. Function: Mainly absorption and covering.

 

c. Columnar Epithelial Tissue : Cells of this tissue are narrow and elongated like acolumn (Fig-5.3)

 

Example: On the internal wall of intestine.

 

Function: Mainly secretion, protection and absorption.



i. Simple Epithelial Tissue: On basement membrane the cells are arranged in asingle layer.

 

Example: Bowman's capsule of ki4ney; renal tubules, intestinal wall (Fig-5.1,5.2:5.3).

 

ii. Stratified Epithelial Tissue: Cells are arranged on the basement membranein more than one layer (Fig-5A).

 

Example: Integument of vertebrate animals.

 

iii. Pseudo stratified Epithelial Tissue: .Cells, of this tissue are arranged in asingle layer on basement membrane. The cells are not of the same height. So this tissue appears to be stratified tissue (Fig-5.5).

 

Example: Trachea.

 

Besides the cells of epithelial tissue. are transformed variously for different functions. As:

 

1.        Ciliated Epithelial Tissue: Found in the wall of the respiratory tube ofvertebrate animals.

 

2.        Flagellated Epithelial Tissue: Found in the endoderm of Hydra.

 

3.        Pseudopodia Epithelial Tissue: Found in pseudopodial cells in theendoderms of Hydra and in the intestine of vertebrate animals.

 

4.  Glandular Epithelial Tissue: This is a kind of epithelial tissue transformedinto gland in the stomach and intestine of vertebrate animals.

 

5.  Germinal Epithelial Tissue: This, is a kind of transformed epithelial tissue.From this tissue sperms and ovum are formed.

 

General Functions of Epithelial Tissue:

 

1.  This tissue form, the external and internal- covering of any organ or tube.

 

2.        After transformation this tissue takes part in , protection; secretion, absorption, diffusion, transportation etc. So, it can be said that epithelial tissue being transformed into glandular tissue and germinal tissue perform various important functions.

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