Physiology 1021 Chapter Notes -Lipid Bilayer, Endoplasmic Reticulum, Membrane Transport Protein
17 Oct 2013
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Centriole: direct dna movement in cell division. Secretory vesicle: transport proteins out of cell. Free ribosomes: manufacturing proteins from amino acids under control of dna. Selectively permeable: some items can cross very easily, while others cross with difficulty and some items cant cross at all. Lipid or fatty acid region: creates the barrier to water-soluble molecules such as ions (na+, k+ cl-, water) Proteins are found in the cell membrane and perform a variety of functions; act as membrane transport mechanisms. Made of proteins that form channels and pores, carbohydrate molecules for cell recognition, cholesterol for stability. Cholesterol molecule: found inserted into nonpolar lipid layer of membrane; helps make membrane impermeable to some water soluble molecules & also helps keep membrane flexible over a wider temperature range. Associated protein: can be attached to either the intracellular or extracellular surface of membrane; There are two ways in which substances can enter or leave a cell:
