Epithelia and Gland Tissue Summary

Epithelia and Gland Tissue
of Tissue 1=200 different cell types
4 Basic Types
•
Epithelial Tissue * Cell types that are part of the same basic tissue can look different

•
Connective Tissue But they have the same embryonic origin .




•
Muscle Tissue
•
Nervous Tissue
Germ Layers Blood is connective tissue !
Ectoderm ( blue) : nervous tissue , skin
↳ Transport of oxygen from lungs
Endoderm ( yellow) : digestive tissue , lung to other cells


mesoderm ( Purple) : muscle , connective tissue
↳ derived from connective
mesenchyme →
embryonic
tissue
Epithelial Tissue
Tissue of cells that are tightly connected to each other
existing
•
Derived from one of the 3 primary germ layers : ectoderm ,
endoderm or mesoderm
Two
•
types :


covering epithelia (skin)
-




Glands ( invagination of epithelial layers) Epithelia cell shapes



lecto.endo.mesodermaDJ-g-a.
g. eBye
-




Flat ' ""
* all are on
classified based on :
connective tissue
/
•

Embryonic origin
2 3
•
Shape of the cells thin for
4- Translational :
changes between squamous and
Number of cell layers (strata) exchange
cubodial
•




Epithelia Cell Layers Epithelia -
collecting duct apical

• No blood circulation
simple →
•
Polarized ( apical -
basolateral) É
• 1 layer
•
Surface specializations
basal
•
Presence of basal membrane
•
Factors reach via diffusion between the
cells
stratified→
• more strong ,


robust Apical Domain
• 1 connective tissue
•
Microvilli : increase surface area




ct ¥q§T
and lots of
layers of
cells
• Cilia : movement , sensory fun




¥ ¥É§
Psuedo for more absorption
→
stratified cilia cilia
.

larger volume

•
have lots of enzymes
•

methabollically
active
•
1 layer of cells → 5✗ larger than microvilli

of
→ Cytoskeleton
microtubule (tubulin)