Prepagation of an action potential in a myelinated axon depends upon which of the following? ? Nodes of Ranvier which are insulated by myelin and internodes with a high density of Na+ leak chan ? Fast, decremental local currents that excite the next node of Ranvier to threshold ? Internodes with a high density of voltage-gated Ca++ channels ? An action potential whose amplitude slowly decreases as it progresses down to the axon terminal ? All of the above
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Step 1: The propagation of an action potential in a myelinated axon is called saltatory conduction. Show more…
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All are true of myelination EXCEPT results from wrapping of a glial cell plasma membrane around an axon causes transmembrane ion exchange across the entire area of the plasma membrane in the axon restricts Na+/K+ ATPases to only the nodes of an axon increases transmission speed of action potentials QUESTION 8 According to the Nernst equation, the equilibrium membrane potential for Na+ in a typical mammalian cell is ______ at 23 degrees ___ at 37 degrees C. more positive; than the same; as less positive; than less negative; than more negative; than QUESTION 9 Opening of which of these would either cause inhibitory postsynaptic potentials or counteract a depolarizing influence given the typical ion distributions of a mammalian cell? Note: to meet these criteria, as long as the channel opening does at least one or another, it fits what's being asked for. Na+ channels Ca 2+ channels K+ channels Cl- channels all of the above B, C, and D C and D
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When are cable properties (decremental conduction) NOT in effect? during the EPSP during the IPSP none of these are correct in the nodes of Ranvier in the myelinated segments of the axon Question 5 If a neurotransmitter causes the opening of a chloride channel, what will happen? none of these are correct an action potential will be triggered the neuron will go from rest toward the critical firing level hyperpolarization depolarization
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With respect to the generation and transmission of an action potential from hillock to terminal button, explain each of the following and their respective roles in the process: Neural integration, voltage-dependent sodium channels, cable properties, myelin sheaths, and nodes of Ranvier.
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