BIOL273 Chapter Notes - Chapter 1: Basal Lamina, Adipose Tissue, Elastic Fiber
11 Sep 2016
School
Department
Course
Professor
Document Summary
Epithelia: protect internal environment of individual and regulate exchange of material between external environment and internal environment- consist of one or more layers of cells connected to one another and to basal lamina (basement membrane). Basal lamina: thin layer of extracellular matrix between epithelial cells and their underlying tissues- composed of a network of collagen and laminen filaments. Connective tissue: structural support and barriers with an extra cellular matrix of proteoglycans, collagen, elastin, fibronectin. 5 types: loose- elastic tissue (tissue under skin), dense- strength (e. g. tendons), adipose- fat, blood, supporting (cartilage, bone) Muscle: ability to contract to produce force and movement. Three types: skeletal- gross body movement, smooth- substances into/out of body, cardiac- only in heart. Neural: carry information form one part of body to other. They can generate and propagate electrical signals called action potentials. Minimal extracellular matrix, limited to a supportive layer called external lamina. Paracrine: chemicals secreted by cells that act on neighbouring cells.
