classification of epithelial tissue on the basis of function performed
Answers
- Simple epithelium
Simple epithelium is a single layer of cells with every cell in direct contact with the basement membrane that separates it from the underlying connective tissue. In general, it is found where absorption and filtration occur. The thinness of the epithelial barrier facilitates these processes.
In general, simple epithelial tissues are classified by the shape of their cells. The four major classes of simple epithelium are:
(1) simple squamous; Squamous epithelial cells appear scale like or flattened or rounded e.g. skin, walls of capillaries, linings of the pericardial, pleural, and peritoneal cavities, as well as the linings of the alveoli of the lungs.
(2) simple cuboidal: these cells may have secretory, absorptive, or excretory functions. examples include small collecting ducts of kidney, pancreas, and salivary gland.
(3) simple columnar; cells can be secretory, absorptive, or excretory; Simple columnar epithelium can be ciliated or non-ciliated; ciliated columnar is found in the female reproductive tract and uterus. Non-ciliated epithelium can also possess microvilli. Some tissues contain goblet cells and are referred to as simple glandular columnar epithelium. these secrete mucus and are found in stomach, colon and rectum.
(4) pseudostratified columnar epithelium; can be ciliated or non-ciliated. The ciliated type is also called respiratory epithelium as it is almost exclusively confined to the larger respiratory airways of the nasal cavity, trachea and bronchi.
- Stratified epithelium
Stratified epithelium differs from simple epithelium in that it is multilayered. It is therefore found where body linings have to withstand mechanical or chemical insult such that layers can be abraded and lost without exposing subepithelial layers. Cells flatten as the layers become more apical, though in their most basal layers the cells can be squamous, cuboidal or columnar.
⤵answer⤵
Epithelial tissues are classified into 6 different types :✔✔
▪Simple squamous epithelia.
▪Simple cuboidal epithelia.
▪Simple columnar epithelia.
▪Stratified squamous epithelia.
▪Stratified cuboidal epithelia.
▪Stratified columnar epithelia.
hope it helps u✌✌
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