HMB302H1 Lecture Notes - Lecture 1: Seminiferous Tubule, Vocal Folds, Tympanic Cavity
Document Summary
Tissue group of similar cells that someimes perform similar funcions, and someimes diferent funcions. 4 types: epithelial issue, connecive issue, muscle issue, nervous issue. *glands originates from invaginaions of epithelial cells; will later on lead to a duct system. Transcellular transport allows molecules to cross epithelial layers (selecive/passive) Absorpion material from a lumen (intesinal track/kidney) Epithelial cells are closely packed together via adhesion molecules (zonulae adherents); that"s why they form sheets (if not, they"ll fall apart) Basement membrane (ct ibroblasts) forms at base of epithelial cells due to secreions of extracellular matrix (forms ight juncions) Epithelia lack blood vessels (avascular) -> obtain nutrients from surrounding ct (at bm) Vein relies solely on blood vessels -> gets nutrients via difusion -> growth determines by how much nutrient the cell gets, which is determined by the blood vessels ??!?!?!?!?! Epithelial cell morphology (3 types in total) Number of cell layers between basal lamina and free surface.
