Epithelium And Glands Flashcards
Simple cuboidal epithelium
Function: secretion and absorption
Location: Kidney tubules; ducts and secretory portions of small glands, ovary surface
Simple columnar epithelium
Function: Absorption, secretion of mucus, and other substances (or reproduct cells) by ciliated action.
Goblet cells [uni]
Location: digestive tract (stomach to anal canal), gallbladder and excretory ducts of some glands
7 functional groups of cells
Secretory, protective, absorptive, transport, contract, connect, internal communication
4 basic tissue type
Epithelial, connective, muscular, nervous
Modes of secretion
Merocrine apocrine holocrine
Tight junctions
Aka occluding junctions/ zonula occludens
preventing ion passage, each strand is formed from a row of transmembrane proteins (claudins and occludins)
Adherens junctions
Aka zonula adherens
- cytoplasm linked to actin cytoskeleton
- Junctions are composed of cadherins (proteins that form homodimers in a calcium-dependent manner)
Gap junctions
specialized intercellular connection between cells
-gap junction channel is composed of connexon
Desmosomes
Aka macula adherens
- cell structure specialized for cell-to-cell adhesion.
- The cell adhesion proteins are (desmoglein and desmocollin), members of the cadherin family
Secretory cells
[feature & location]
Numerous secretory granules
[endocrine & exocrine]
Protective cells
[feature & function]
Flat cells, wide and thin (shingles)
Protect
Absorption cells
[feature & function]
- Fuzzy border
- Increase SAxV ratio (microvili)/ absorb material ex gut, reprod
- Square columnar
Transport cells
[feature & function]
Flagella or cilia
Move cell or fluid ex respiratory
Connect/support cells
[feature & function]
Prominent nucleus/ active
Fusiform/ovoid
Produce extracellular matrix
Contractility cells
[feature & example]
Columnar to fusiform (not flat)
Myofibrils ex actin myosin
