Answer:
The table given
below summarizes the structure, location and function of the epithelialtissue
structure
Location
Functions
Structure Simple squamous
epithelium (pavement epithelium) Its composed of single layer of flat cells
This epithelium is present
in/the terminal bronchioles and alveoli of the lungs, walls of Bowman's
capsules and descending limb of loop of Hen Ie. In the blood vessels and
heart it is called endothelium. In coelom, it is called as mesothelium
Protection, excretion gaseous
exchange and secretion of coelomic fluid.
Structure
Location
Functions
Simple cuboidal epithelium It
is composed of short cube-shaped cells with round nuclei located in centre of
the cells. The cells of cuboidal epithelium often form microvilli on their
free surface.
This epithelium is present in
the small ducts of salivary glands and pancreas, thyroid vesicles, part of
membranous' labyrinth, proximal and distal convoluted tubules of the nephrons
of kidneys, ovaries, seminiferous tubules and ciliary bodies.
Protection, secretion
absorption and excretion.
Simple columnar epithelium
In this, the cells are
elongated and placed side by side like column, The outer free surface of each
cell is slightly broader.
This epithelium contains
goblet (or mucous) cells.
It lines the stomach,
intestine, gall bladder and bile duct.
It also forms the gastric
glands, intestinal glands and pancreatic lobules.
Protection.secretion and
absorption.
Simple ciliated epithelium
This is made of cell bearing
numerous delicate hair like outgrowth, arising from basal granules.
Mucous secreting goblet cells
are also present in them
These are present in the respiratory
tract and Fallopian tubes (oviducts), in certain parts of nephrons in the
kidney.
Protection as well as
movement of mucus, urine, eggs and cerebrospinal fluid in particular
direction, with help of cilia
Compound stratified
epithelium It has many layers of epithelial cells, the deepest layer made of
cuboidal cells. It is of four types
(i) Stratified squamous
epithelium.
(ii) Stratified cuboidal
epithelium.
(iii) Stratified columnar
epithelium. (iv) Stratified ciliated columnar epithelium.
Occurs in the epidermis of
skin of land vertebrates. Oral cavity, tongue, pharynx, eye lids and cornea
of eyes. Covers the epiglottis, lines the larynx and upper part of palate.
It is found on dry surfaces
and are subjected to wear and tear i.e., skin, nails. Protects, underlying
structures of body.
Structure
Location
Functions
Compound transitional
epithelium It lines the larynx and It consists of 4 to 6 layers of cells.
There is no germinative layer or basement membrane but shows mitosis. The
inner most cells rest on under lying connective tissue.
It lines the larynx and upper
part of the soft palate.
It forms epidermis of fishes
and many urodeles.
It is present in renal
pelvis, ureters, urinary bladder and part of the urethra.
It permits distention thus,
urinary bladder can be stretched considerably without being damaged.
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