Simple Squamous Epithelium • Single layer of flat cells – lines blood vessels (endothelium), closed body cavities (mesothelium) – very thin --- controls diffusion, osmosis and filtration What is the primary function of this tissue (protection or transport)? (Hint: What is its function as an endothelium,…as mesothelium?)
Simple Cuboidal Epithelium • Single layer of cube-shaped cells viewed from the side Where would you find simple cuboidal epithelium in the body? Does it typically function in protection or transport in these locations?
Nonciliated Simple Columnar • Unicellular glands =goblet cells secrete mucus – lubricate GI, respiratory, reproductive and urinary systems • Microvilli = fingerlike projections of cell membrane Describe the differences between cilia and microvilli in terms of both their structure and function. Are you likely to find them on the same tissue? Why or Why not?
Stratified Squamous Epithelium • Several cell layers thick • Surface cells flat • Keratinized = surface cells dead and filled with keratin – Example…? • Nonkeratinized = no keratin in moist, living cells at apical surface – Example …? What is the primary function of this epithelium? If this epithelium is a portion of a mucus membrane, where does the mucus come from?
Transitional Epithelium • Multilayered • Surface cells varying in shape from round to flat if stretched List the expandable organs of the • Lines hollow organs of the urinary urinary tract. tract that expand from within
Pseudostratified Columnar • Single cell layer • All cells attach to basement membrane but not all reach free surface • Nuclei at varying depths Name one location where you would find this epithelium. How would you describe its function?