ANIMAL TISSUES- EPITHELIALTISSUESCIENCECBSE IX
On the basis of their function, animal tissues are
of four major types. They are epithelial tissue, connective tissue, muscle
tissue and nervous tissue.
Let us examine the structure the structure and
functions of these four kinds of tissues in animals ( including man).
Epithelial tissue: epithelial tissue forms a
covering over the surface of the body as well as on the outside and inside of
several internal organs example skin is an epithelial tissue on the outer side
of the body. Lining of the digestive tract is a covering of epithelial cells on
the internal organ.
Epithelial cells perform several functions- they
offer protection, produce structure like hair, nails, feather and horns, in the
form of gland cells, they secrete a variety of chemical and may involve in
receiving external stimuli.
Cells in the epithelial are very close to each other
and are joined together by a cementing substance. Epithelial cells occur in
various shapes, flat, cube like, long and cylindrical.
Epithelialcells lining the digestive and respiratory system of several animals have hair
like projections called cilia. They help in moving the food particles or mucus.
Epithelial cells may be present in a single layer or
may occur in multiple layer stratified epithelium.
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