PHIS 206 Lecture Notes - Lecture 3: Cell Membrane, Fluid Mosaic Model, Tight Junction
13 Sep 2016
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If outside environment changes, inside can maintain itself (homeostasis) Head = polar, negatively charged, water-loving (hydrophilic) Tails = long carbon chains, non-charged, hydrophobic. Hydrophobic = lipidphillic (oily) =, hydrophilic = watery. Lipid bilayer tails face each other (both hydrophobic), heads face watery environment of ecf and icf. Cholesterol = important part of every cell membrane, rigid, changes the way they operate, cannot live without cholesterol. Compartments ecf and icf are different (ionic composition, different ph, different nutrients: separated by lipid bilayer, membrane = fatty can flow, liquid nature (fluid) so cytoskeleton features keeps cell together. Main purpose is so inside and outside of cell can be different without affecting cell. Desmosome strong connection between cells between the cytoskeletons of cells) primarily how cells attach to each other. Ex: cells of gut and cells of mouth that need to do two different things.
