Topic Epithelial Tissues Types and Functions BEd Hons Secondary Semester IV ID: 933633
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Slide1
Unit 1: Organization of Animal Bodies
Topic
: Epithelial Tissues
Types and Functions
B.Ed
(
Hons
) Secondary Semester IV Subject: Advance Biology II Course Title: Animal Form and Function–I
Represented By: Ms Sidra Younis Department of Education(Planning and Development)
Lahore College for Women University, Lahore
Slide2Epithelial
tissues
covers the outside of body and lines organs and cavities. The cells in this tissue are very closely packed together. This tissue has many types on the basis of the shape of cells as well as the number of cell layers.
EPITHELIAL TISSUES
Slide3Cells of epithelia are closely connected and are not separated by intracellular material.
Three basic types of connections
CELL TO CELL JUNCTIONS
Slide4The cells making up epithelia are often closely bound to one another through specialized structures called tight junctions.
They are also free from blood vessels and nerves and are supported by a connective tissues called basement membrane.
TIGHT JUNCTIONS
Slide5Anchoring junctions are common on the lateral and basal surfaces of cells where they provide strong and flexible connections.
In contrast with the tight and anchoring junctions. A gap junction forms an intercellular passageway between the membranes of adjacent cells to facilitate the movement of small molecules and ions between the cytoplasm of adjacent cells.
ANCHORING JUNCTIONS
GAP JUNCTIONS
Slide6Slide7TYPES
OF EPITHELIAL
TISSUES
Slide81: SQUAMOUS EPITHELIUM
C
onsists of a single layer of flat cells. It is found in lungs, heart and blood vessels.
It
allows the movement of materials across it.
Slide92: COLUMNAR
EPITHELIUM Has elongated cells. It is found in alimentary canal, gall bladder etc.
It
makes
secretions.
Slide103: CUBOIDAL EPITHELIUM
C
onsists of a single layer of cube-shaped cells.It is found in kidney tubes, small glands etc. It makes secretions.
Slide114:
CILIATED COLUMNAR EPITHELIUM
Epithelium has elongated cells with cilia.It
is present in
trachea and bronchi
It propels
mucous
.
Slide125: STRATIFIED SQUAMOUS
EPITHELIUM
It has many layers of flat cells.It is present in the lining of oesophagus and mouth and also over the skin.
It protects the inner
parts of body.
Slide13Glandular epithelium is a type of epithelial tissue which covers the glands (both exocrine and endocrine) of our body.
Their main function is secretion.
Both endocrine and exocrine glands produce their secretions through the glandular epithelium via special cells called goblet cells
6: GLANDULAR EPITHELIUM
Slide14GLANDS CLASSIFICATION
Endocrine Glands
Exocrine GLANDS
A
ductless gland that releases secretions directly into surrounding tissues and fluids (endo- = “inside
”)
For examples:
Pineal gland, pituitary gland, thyroid gland etc.
An exocrine gland whose secretions leave through a duct that opens directly, or indirectly, to the external environment (exo- = “outside
”).
For examples:
Salivary glands, Sweat glands etc.
Slide15Covering and lining
the outer
layer of skin.To protect the tissues that lie beneath from radiation, desiccation, toxins, invasion by pathogens, and physical trauma.Inside the body epithelial cells form the lining of the mouth and alimentary canal and protect these organs.
Absorb water and digested food in the lining of digestive canal.
To provide sensation.
EPITHELIAL TISSUES FUNCTIONS
Slide16CONT…
Help in the elimination of waste.
The regulation and exchange of chemicals between the underlying tissues and a body cavity.Play an important function in the secretion of hormones into the circulatory system, as well as the secretion of sweat, mucus, enzymes, and other products that are delivered by ducts.