hello , can anyone help me please. ( what is the function of stretified epithelial tissue )
Answers
Answer:
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Explanation:
Epithelium: Stratified Epithelia
Stratified epithelia contain two or more layers of cells.
The function of this type of epithelium is mostly protective - the higher the number of layers, the more protective it is. It is good at withstanding abrasion.
This type of epithelium is constantly renewing itself. Cells in the bottom layer divide, and the daughter cells move towards surface maturing and then degenerating.
This type of epithelium can either be keratinising (i.e. the skin) or non-keratinising (i.e. the oesophagus).
Stratified squamous keratinising epithelium
This type of epithelium is protective against chemical and mechanical damage, and water loss, and is found in skin, and oral epithelia.
This is an example of thin skin. There are around 8-10 layers of cells. It's difficult to see the basal lamina in the region of the dividing cells, in the basal layer. Notice how the cells become more flattened towards the top (apical) layer. Cells at the top are flattened and have flattened nuclei - these cells are dying.
Answer:
The function of stratified epithelium is mainly protection. In fact, this specific role is reflected in the direct influence of the type of physical stresses on the degree and nature of the stratification. To perform their main function adequately, stratified epithelium is also quite thick, making it particularly poor for secretion or absorption. However, some stratified surfaces exhibit some degree of permeability for water and small molecules.