epithelium and glands

• functions of epithelium

  secretion, absorption, diffusion, protection, containment
• classification of epithelium

  shape, layers, specialisations
• desmosomes have intermediate filaments anchoring into thier plaques
• desmosomes are more electron dense than belt desmosomes
• hemidesmosomes have intermediate filaments anchoring into them
• basement membrane gives polarity, shape, acts as interface, and controls cell migration during wound healing
• simple squamous doesnt really need microvilli but still has some
• stereocilia in epidiymis contains enzymes that modify sperm and absorb excess fluid
• stereocilia in the ear enables hearing and balance
• cilia have a core of microtubules
• cilia arise from basal bodies
• goblet cells have secretory granules (containing mucin) at the apical part
• sublingual is 80% mucous and 20% serous
• endocrine in pancreas

  islets of langerhans, produce insulin and glucagon
• exocrine in pancreas

  digestive enzymes