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A & P EXAM 2
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Tissue
A group of closely
associated cells
working toward a common
goal
Types of Epithelial tissue
1. Covering and lining
2. Glandular
Glandular Tissue
Epithelial tiusse that forms glands of the body
Covering and lining Tissue
on the
free suface
of the body
associaged with
skin
and
ventral cavity
membrane
Special characteristics of Epithelial tissue
1. Cellularity
2. Specialized contacts
3. Polarity
4.Supported by connective tissue
5. Avascular but innervated
6. Regeneration
Epithelial tissue
Cellulartiy
Characteristic
consists of
closely
packed cells
Epithelial tissue
Specialized contacts
cells
fit
together for form
sheets
Epithelial tissue
Polarity
posses two different surfaces
1. Apical surface
2. Basal surface
Apical
polar surface
upper
(free)
exposed
surface
always facing something like
organ
Basal
Polarity Surface
lower
a
ttached
surface
sits on
connective tissue
Epithelial
supported by connective tissue
which typically have
good blood supply
Epithelial tissue
avasular but innervated
No
blood
supply
Good
nerv
e supply
Epithelial
Regeneration
high
rate of cell division
Classification of Epithelia
1. Shape
2. Number of layer
3. Glandular
Epithelia
cell shape
classification
1.Squamous
2.Cuboidal
3. Columnar
Epithelia cell shape
Squamous
thin and flat
looks like a
fried egg
easliy manipulated
Epithelia cell shape
Cuboidal
shaped like
tiny sugar cubes
Epithelia cell shape Columnar
shaped like
tiny columns
has
microvilli
typically
nucleus on bottom
Epithelial
number of layers
Classification
1.
Simple
epithelia
2.
Stratified
epithelia
Classification of layer
Simple
epithelia
1. Simple squamous
2. Simple cuboidal
3. Simple Columnar/Pseudostratified Columnar
Simple squamous cells
areas of
diffusion-
lungs
sheet rapped in a circle (ex. around an air sac)
SImple cuboidal
Classification of layer
not tall
not flat
glands and ducts
looks like a circle of cells around a
gland or a duct,
outside the circle is connective tissue or other cells
Simple columnar
Classification of layer
1.
Goblet cells
the produce mucus (lube)
2.
Microvilli
to increase surface area (digestion)
3.
Cilia
to move things (resptory system)
Pueudostratified columar
Classification of layers
Simple= one row
many times all you can see in the nucleus
barriers can be hard to see
What defines cell
outter
most layer
Classification of layers
Stratified epithelia
two
or more layers of cells, named for the shape of its outter layer
Different Classifications of
Stratified epithelia
1. Stratified Squamous
2. Stratified Cuboidal
3. Stratified columnar
4. Transitional
Stratified squamous
protetive areas
20-30 rows
more blood supply is at basal level than apical level
top row of cells mostly dead, hair and skin
found in
Tonge, Mouth, and Pharynx (throat)
KERATINIZED
Keratinized (stratified squamous)
Contains
keratin
waterproofing or resistant
skin
ONLY
Stratified cuboidal
rare
typically only
two
layers deep
look for large duct
Stratified Columnar
Rare
a few rows at
most 3 layers
digestive tract
Transitional (stratified)
allows
stretching
dome shaped
BLADDER
Author
ChapinJeanie
ID
173399
Card Set
A & P EXAM 2
Description
I. Tissues and the Living Fabric EPITHELIAL TISSUE
Updated
9/25/2012, 11:22:39 PM
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