PSIO 303B Study Guide - Midterm Guide: Lateral Geniculate Nucleus, Photoreceptor Protein, Cell Membrane
11 May 2015
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Integral- hydrophilic region within membrane- hydrophilic on inside out outside i. Transporter pumps and channels- regulate cytoplasmic solute comp and proteins anchor to extracellular matrix of neighboring sell: ex. Predominant in peripheral retina: rhodopsin rod photoreceptor protein and antibodies to rhodopsin localize to the rod cells, cones- less sensitive to light but color vision. Cytoskeleton and cilia: cytoskeleton- arrangement of protin fibers that cell shape definition and maintenance, mechanical strength, locomotion, intracellular transport of organelles, chromosome separation in mitosis and meiosis, filaments, microfilaments (actin filaments)- strands of actin (7nm two strands). Influence motility ( white blood cells and amoeba) and shape. When actin interacts with myosin (thick) generate muscle force. ii. Vimentins- mechanical strength to muscle and other cells: microtubules strands of tubulin (25nm coil of 13 protofilaments built from dimers of alpha and beta tubulin). Sweep fluids across cells in trachea and fallopian tubes: photoreceptor specialized cilium(9+0, flagella whip like structure undulate to move cells like sperm.
