Integrating Cells into Tissues Flashcards
Name 3 ways cells are held together
- Cell to cell adhesion molecules
- Extracellular matrix protein fibres
- Close proximity
What is the composition of epithelial tissue?
- Basal lamina base mat which cells are bound to
- Cells joined by cell to cell adhesions
- Strong intracellular protein filaments
Where is the majority of epithelial tissue found?
All cavity and free surface linings
How is epithelial tissue connected to other tissues?
By the basal lamina
What are the 6 types of epithelial cell adherence systems?
- Tight Junction
- Adhesion Belt
- Desosome
- Gap Junction
- Hemi-Desosome
- Focal Adhesion
Which is the strongest epithelial cell adherence system?
Desosome
What is the Tight Junction function?
Joins neighbouring cells to prevent leakage
What is the function of an Adhesion Junction?
Found in pairs and join actin bundles between cells to stabilise
What is the function of a Desosome?
Joins intermediate filaments between cells to provide strength
What is the function of a Gap Junction?
Allows passage of water-soluble ions and molecules to communicate changes
What is the function of Hemi-Desosomes and Focal Adhesions?
Anchors filaments to the basal lamina
What is the structure and function of mucosal membranes?
- Combination of epithelium, basal lamina and lamina propitious
- Stops pathogens, prevents tissue dehydration and lubricates
What is the structure and function of the GI tract?
- Mucosa, submucosa, muscularis and serosa
- Absorption, prevent pathogen ingress and moves contents
What is the structure and function of the urinary tract?
- Contains squamous, cuboidal and transitional epithelium
- Absorbs nutrients, waste removal and prevents pathogen entry
What is the structure and function of the respiratory tract?
- Mucosa, submucosa and cartilage
- Secrete mucous and enzymes
- Folds in basal lamina of alveoli allow for expansion
