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Transcript of Epithelial Tissue
In a simple epithelium the name is determined by the shape of the cells
In a stratified epithelium the name is determined by the shape of the cells on the apical layer
Types of surface modification can be classified into two types
What is Epithelial Tissue?
A layer of cells that covers all of the surfaces and openings on the body
Specialized to form the covering of all internal and external body surfaces
What does it do?
Epithelial tissue serves five main purposes in an organism's body
Protects the tissue that lies underneath from outside stimuli.
Contains nerve endings in skin, eyes, nose, and tongue
Removes wastes from the kidneys
Simple epithelium helps with the diffusion of gases, liquids, and nutrients
How do you classify and name Epithelial Tissue
The three things that decides the name of the epithelium is:
1) Number of cell layers
2) Cell shapes
3) Surface modification
Number of Cell Layers
One layer of cells rests on the basement membrane
Multiple layers rest on the basement membrane
Simple Squamous Epithelium
Stratified Squamous Epithelium
Approximately tall as they are wide
Absorb nutrients in the lining of the small intestine
Simple Cuboidal Epithelium
Stratified Cuboidal Epithelium
Simple Columnar Epithelium
Taller than wider
Stratified Columnar Epithelium
Cilia and Sterocilia
Cilia and stereocilia are similar filament-like structures projecting from the apical cell surfaces.
Cilia beat in rhythmic motions to propel substances across the apical surfaces of cells.
Cilia act as an important cleansing mechanism for the respiratory tract
Microvilli are uniform folds of the membrane on the apical cell surfaces.
Repeated folding increases surface area for more efficient absorption, secretion, or excretion
Form the "brush border" of the small intestine where most absorption in our bodies occurs.
Also found on some kidney tubule cells and on osteoclasts, a cell involved in bone resorption.
Annamarie B., Maria B., Jasmine K., Marvin T,