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Epithelia and Gland Tissue Summary

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Lecture summary of epithelia and gland tissue

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  • November 26, 2022
  • 4
  • 2021/2022
  • Summary
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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)

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