Mind and Brain Review Session.docx

Mind and Brain Review Session.docx - Mind and Brain Review...

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Mind and Brain Review Session Exam structure o 30 MCQ (1 point each) o 5 short definition, 1-2 sentences (2 points each) o 2 longer questions (5 points each) Effect of too much EPSP on action potential o Action potentials are considered all or none If membrane potential meets threshold, neuron fires, regardless of whether it meets or exceeds. There is an absolute refractory period where the neuron cannot fire again. There is also a relative refractory period during the undershoot where a stronger than normal stimulus triggers the neuron firing. More EPSP doesn’t increase the peak of action potentials but it increases the firing rate (See slide 27) How does salutatory conduction speed up propagation of action potential? o The speed of a conductor depends on the conductive surroundings. Current can leak out. Myelin makes the membrane less leaky to the poor conductivity of the cytosol and myelin simply insulates the axon and prevents ions from leaving and increasing conductivity. Nodes of ranvier are important because they improve the strength of the
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  • Spring '16
  • Action Potentials, Relative refractory period, Post Synaptic Potentials, potential meets threshold, Brain Review Session

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