Z331 Fall 2010 Ecampus Week 5 Membrane Potential Synapse Posted

Z331 Fall 2010 Ecampus Week 5 Membrane Potential Synapse Posted

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Week 5: Lecture 3: Chapter 10 –   Muscular Tissue: Membrane Potential &  Synapse
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Sending signal to actin &  myosin:  Skeletal Muscle  Contraction 5 Basic Steps: 1. Action potential moves  down motor neuron 2. Neurotransmitter (Ach)  released by motor  neuron 3. Ach initiates action  potential (AP) in muscle  fiber 4. Muscle AP triggers Ca 2+   release from SR 5. Ca 2+  initiates contraction Figure 10–9, 293
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Action Potential (AP) Electrical signals travel from brain or  spinal cord along axons to muscle fibers  (or other neurons) causing them to  contract Figure  12-7, 391
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ATP Figure 25-1, 916 Figure 2–24,  57 Figure 3–9, 77 “Cellular fuel”
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Cell membrane is  selectively  permeable: allows some materials  to move freely restricts other materials Concentration is the  amount of solute in a  solvent Concentration gradient:  more solute in 1 part of  a solvent than another Figure 3–15, 87
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