IMED1001 Study Guide - Quiz Guide: Desmosome, Mucus, Microvillus
Important Notes - Epithelium:
Epithelium:
-covering
-lining
Histology:
-Tubular structure will be seen as circle because in histology we look at it as SECTIONS
-Compactly arrange cells
-= little or no gaps between cells
-Cells are connected by special microscopic arrangements called junctions
-Strong to make sure doesn't knock over
-Control what passes through
Structure:
-Epithelium is a compact sheet with cells join together
-no space for blood vessels or capillaries
-=avascular
Layers/Location:
-Some cells of epithelium rest on a basement membrane
-BM is partly produced by epithelial cells and connective tissues (non cellular)
-Just a layer of bio macromolecules!!
About Junctions:
-If cells are small, junctions between them are largely specialised protein molecules
Adhering Junctions:
-Have strong bonds but eventually cells will be lost from an epithelium
Occluding Junctions:
-Seal off
-Control what passes through
Both adhering and occluding junctions have various sizes and shapes
Gap/Communicating Junctions:
= allows communication!
2 cell membranes meet = “junction”
Document Summary
Tubular structure will be seen as circle because in histology we look at it as sections. = little or no gaps between cells. Cells are connected by special microscopic arrangements called junctions. Strong to make sure doesn"t knock over. Epithelium is a compact sheet with cells join together. No space for blood vessels or capillaries. Some cells of epithelium rest on a basement membrane. Bm is partly produced by epithelial cells and connective tissues (non cellular) If cells are small, junctions between them are largely specialised protein molecules. Have strong bonds but eventually cells will be lost from an epithelium. Both adhering and occluding junctions have various sizes and shapes. Desmosome has thickening of membrane and protein molecules are driven with complex arrangements lling gaps between cells. Might also need help of other molecules for transportation. = requires energy and epithelium required to be made of single layer cell to reduce resistance when transporting.
