BIOL 221 Lecture Notes - Lecture 2: Stratified Squamous Epithelium, Epithelium, Mesenchyme
16 Sep 2016
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Document Summary
Tissues: collections of specialized cells and cell products that carry out limited functions. Epithelia tissues: tissues that cover exposed surfaces, lines internal passageways and champers, and forms glands. Connective tissues: fills internal spaces, provides structural support, transports materials within the body, and store energy. Muscle tissue: specialized tissue for contraction. Neural tissue: carries information in the form of electrical impulses. Cellularity: high density of cells in small areas. Apical surface: the part of the cell that faces the external environment. Basal surface/ basolateral surfaces: the part attached to the basement membrane/basal lamina. Avascularity: they do not have blood vessels. Cell adhesion molecules (cams): adhesion molecules that are transmembrane and exist inside the membrane to prevent entry into tissue. Intercellular cement: proteoglycans (high in sugar, hyaluronan (includes hyaluronic acid) Can be broken down by hyrulodase (found in the head of sperm and the blastocyst) Allow rapid communication and the diffusion of ions. Held together by channel proteins (connexons: tight junctions.
