BIOL302 Lecture Notes - Lecture 4: Exocrine Gland, Chicken Wire, Hemidesmosome
Document Summary
Function of epithelium: tight junctions trans-membrane, tight form = barrier, abrasion resistance, material moved across cells to lumen of duct, seen in our endocrine glands, glands that are specialized to secrete, pancreatic gland. Absorption: folding helps with increasing sa = more absorption. Squamous o nuclei has an obvious bulge: mesothelium, lines the outside of organs, endothelium, lines blood vessels. Columnar o nuclei is basil in same level: microvilli = goblet cells, ciliated = no goblet cells, only found in female reproductive system. Pseudostratified: all cells contact basal surface, can be both ciliated or have stero- cilia. Squamous o basal is usually cuboidal: lots of layers, surface = squamous, keratinized or non- keratinized. Transitional: multiple layers, prominent round nuclei, way they are joined allows for stretching, pillow cells are very prominent feature. Description: absorption, same thing with the greater the sa. More absorption: cannot move, cannot see individual, 50% of nuclei.