BMS 250 Chapter Notes - Chapter 5: Glycoprotein, Brush Border, Cell Nucleus
Document Summary
An epithelium typically exhibit a range of permeability; it may be relatively non-permeable to some substances, while promoting and assisting the passage of other ions and molecules: secretions: some epithelial cells are specialized to produce and release secretions. These nerve endings- and those in the underlying connective tissue- continuously relay sensory input to the nervous system concerning touch, pressure, temperature, and pain. Additionally, several organs contain a specialized epithelium called, a neuroepithelium, that houses specific cells responsible for the sense of sight, taste, smell, hearing, and equilibrium. The body contains many different types of epithelial, and the classification of each type is indicated by a two-part name. The first part of the name refers to the number of epithelial cell layers, and the second part describes the shape of the cells at the apical surface of the epithelium. Classification by number of cell layers: epithelia may be classified as either simple or stratified.
