PNB Exam 2 Lecture.docx - CELL MEMBRANE DYNAMICS Plasma...

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CELL MEMBRANE DYNAMICS Plasma Membrane Surrounds cells and organelles in the cell Membrane is lipid bilayer (2 layers of fatty particles) Phospholipids are amphipathic Fatty substance with phosphate group attached Amphipathic: uneven distribution of charge (nonpolar & polar) Hydrophobic: tails, nonpolar Hydrophobic effect: want to get away from all water molecules, tails face inward Hydrophilic: heads, polar Forms hydrogen bonds Plasma Membrane Proteins Peripheral proteins Attach to either inner or outer face of membrane Integral proteins Protrude partly or all the way across membrane Include channel proteins and carrier proteins Plasma Membrane Functions Physical barrier Exchange Communication Attachment
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Types of Transport Paracellular transport Between cells Transcellular transport “Through cell” Membrane Transport Membranes are selectively permeable Few molecules are permeable Gases Small lipid soluble compounds Two Types of Membrane Transport Passive transport Does not require energy Diffusion Subtypes Simple diffusion
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  • Fall '11
  • KristenKimball

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