The document discusses different types of epithelial tissues. There are 5 main types of tissues including epithelial tissue, connective tissue, muscle tissue, nervous tissue, and bone tissue. Epithelial tissues cover surfaces and glands, and allow for secretion and absorption. The document describes several types of epithelial tissues in detail, including their structure, cell shape, layers, and functions. Types discussed include simple squamous, simple cuboidal, simple columnar, pseudostratified columnar, stratified squamous, stratified cuboidal, and stratified columnar epithelial tissues. Transitional epithelial tissue is also mentioned.

1. BY
MAYURCHAKRABORTY
ASSISTANT PROFESSOR, BENGAL
SCHOOL OF TECHNOLOGY, HOOGHLY

2.  a group of cells specialized to perform a particulara group of cells specialized to perform a particular
functionfunction
 tissue = cells + extracellular matrixtissue = cells + extracellular matrix
– nonliving portion of a tissue that supports cellsnonliving portion of a tissue that supports cells
 There are 5 types of tissuesThere are 5 types of tissues
– Epithelial tissues give protection, allow secretion andEpithelial tissues give protection, allow secretion and
absorptionabsorption
– Connective tissues support soft body parts and bindConnective tissues support soft body parts and bind
structures togetherstructures together
– Muscle allow movementMuscle allow movement
– nervous tissues conducts impulses used to help control andnervous tissues conducts impulses used to help control and
coordinate body activitiescoordinate body activities
– Bone tissues forms structural unit of the bodyBone tissues forms structural unit of the body

3. Simple = one layer
Stratified = more than one layer
Pseudostratified = false layered (appears to be more than one
layer, but only one); ciliated = with cilia
Terms referring to the cell shapes
Squamous = flat
Cuboidal = cube
Columnar = rectangular (column)
Transitional = ability to change shape

4. Stratified
Simple
Apical surface
Basal surface
Apical surface
Basal surface
Classification based on number of cell layers.

5. Squamous
Cuboidal
Columnar
Classification based on cell shape.

6. The following types of epithelial tissues are covered in this activity:
. Simple squamous epithelial tissue (lungs)
. Simple cuboidal epithelial tissue (kidneys)
. Simple columnar epithelial tissue (small intestine)
. Pseudostratified (ciliated) columnar epithelial tissue (trachea lining)
. Stratified squamous epithelial tissue (mouth lining)
. Stratified cuboidal epithelial tissue (salivary glands, sweat glands)
. Stratified columnar epithelial tissue (male reproductive tract)
Transitional epithelial tissue (bladder)
a. The tissue may show a full bladder
b. The tissue may show an empty bladder

7.  a single layer of thin,a single layer of thin,
flattened cellsflattened cells
– look like a fried egglook like a fried egg
 easily damagedeasily damaged
 common at sites ofcommon at sites of
filtration, diffusion,filtration, diffusion,
osmosis; coverosmosis; cover
surfacessurfaces
 air sacs of the lungs,air sacs of the lungs,
walls of capillaries,walls of capillaries,
linings of blood andlinings of blood and
lymph vesselslymph vessels

8. •  Description: Single
layer of
cubelike cells with
large,
spherical central
nuclei
 Function: Secretion
and
Absorption

9.  single layer of cellssingle layer of cells
that are longer thanthat are longer than
they are widethey are wide
– nucleus located nearnucleus located near
basement mem.basement mem.
 ciliated or nonciliatedciliated or nonciliated
 some have microvillisome have microvilli
 goblet cells = secretegoblet cells = secrete
mucusmucus
 absorption, secretion,absorption, secretion,
protectionprotection
 linings of the uterus,linings of the uterus,
stomach, and intestinestomach, and intestine

10. • Description: Single
layer of cells of differing
heights, some not
reaching the free
surface; nuclei seen at
different levels; may
contain mucus-
secreting cells and bear
cilia.
• Function: Secretion,
particularly of mucus;
propulsion of mucus by
ciliary action

11.  Description: Thickmembrane
composed of several cell layers;
basal cells are cuboidal orcolumnar
and metabolically active; surface
cells are flattened (squamous); in
the keratinized type, the surface
cells are full of keratin and dead;
basal cells are active in mitosis
and produce the cells of the
more superficial layers
 Function: Protects
underlying
tissues in areas subjected to
abrasion

12. StratifiedStratified
cuboidalcuboidal
epitheliumepithelium
 2 or 3 layers of2 or 3 layers of
cuboidal cellscuboidal cells
 protectionprotection
 linings of largerlinings of larger
ducts of mammaryducts of mammary
glands, sweatglands, sweat
glands, salivaryglands, salivary
glands, andglands, and
pancreaspancreas
Stratified columnarStratified columnar
epitheliumepithelium
 protection andprotection and
secretionsecretion
 vas deferens, partvas deferens, part
of the maleof the male
urethra, parts ofurethra, parts of
the pharynxthe pharynx
(throat)(throat)

13.  Description: Resembles
both stratified squamous
and stratified cuboidal;
basal cells cuboidal or
columnar; surface cells
dome shaped or squamous
like, depending on degree of
organ stretch.
 Function: Stretches readily
and permits distension of
urinary organ by contained
urine

14.  cells that are specialized to produce andcells that are specialized to produce and
secrete substances into ducts or into bodysecrete substances into ducts or into body
fluidsfluids
 gland = 1 or more cuboidal or columnargland = 1 or more cuboidal or columnar
cellcell
 secretionsecretion
 salivary glands, sweat glands, endocrinesalivary glands, sweat glands, endocrine
glandsglands

15. THANK
YOU