diversity of cells and their function Flashcards
what colour does Haematoxylin stain acidic molecules
purple
what does Eosin stain basic molecules
pink
what does epithelium do
cover surfaces of the body, line hollow organs and form glands - it is also non-vascular
what backs the epithelium
a basal lamina (basement membrane) - thin layer of specialised extracellular material between the basal surface of epithelial cells and the underlying tissue
what are cells in the epithelium
polarised
apical
faces the lumen of a tube or the external environment
basal
attaches to the basement membrane
name the functions of the epithelium
- mechanical barrier
- Chemical barrier
- Absorption
- Secretion
- Containment
- Locomotion
squamous
flattened
cuboidal
cube
columnar
tall and thin
simple
one layer
stratified
2+ layers
pseudostratified
multiple layers, all in contact with basal lamina
what are the cell/ tissue surface specialisations
- Microvilli
- Cilia
- Keratinized