Physiology Study Notes Test 1.docx

Composes of channels receptors docking markers

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Composes of channels, receptors, docking markers, carrier molecules, CAMs, peripheral proteins Cell-to-Cell Adhesions o CAMs o Extracellular Matrix Collagen – tensile strength Elastin – allows for stretching and recoiling Fibronectin – holds cell in position o Specialized Cell Junctions Desmosomes (adhering junctions) Gap Junctions (communicating Junctions) Impermeable Junctions (Tight Junctions) Membrane transport o Fick’s Law Particles will be more soluble if: Steeper concentration gradient Increased surface area of membrane (more particles to diffuse) Lipid soluble and uncharged Distance at which diffusion must take place is smaller Module 2 Types of Conduction o Saltatory – jumps between nodes of ranvier o Contiguous – goes through every point of axon terminal
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o Chemical Synapse Action potentials traveling down axon terminal stimulate Ca2+ channels Ca2+ starts enters synapse Ca2+ stimulates SNARE proteins to bind neurotransmitter vesicles to the docking site of the synapse Vesicles release neurotransmitter via exocytosis Neurotransmitter binds to Na+/K+ channel receptors, which stimulates the opening of the channels Excitatory Synapse
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  • Summer '14
  • Jamnik,Ronnie
  • Specialized Cell Junctions,  Gap Junctions

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