BIOL 141 Lecture Notes - Lecture 4: Stratified Squamous Epithelium, Simple Squamous Epithelium, Transitional Epithelium
Document Summary
Tissues: layers or groups of similar cells with common functions. Epithelial: body surfaces and cavities; protection, secretion, absorption and excretion. Secretion: releasing something to stay in the body. Free surface exposed to outside or internal open space. Basement membrane: thin, nonliving layer that anchors to underlying connective tissue. Simple squamous epithelium: single layer of thin, flat cells; diffusion and filtration (ex. Simple cuboidal epithelium: single layer of cube-like cells; secretion and absorption (ex. Simple columnar epithelium: single layer or elongated cells; protection, secretion, and absorption (ex. Microvilli increase surface area for things to absorb (projections of cell) Pseudostratified columnar epithelium: elongated cells that appear stratified but are not; protection, secretion, movement of mucus (ex. Stratified squamous epithelium: many layers, outer, flat (ex. Keratin: protein accumulates in outer layer of skin, hardened and waterproof; protection. Stratified cuboidal epithelium: several layers of cube-like cells; protection (ex. Stratified columnar epithelium: several layers of elongated cells; protection and secretion (ex.
