psych180_lec5 - During the absolute refractory period it is...

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The Action Potential Generation and Conduction of the Nerve Impulse
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A voltage of – 70 mV is likely to indicate that we are recording the neuron’s ______ potential a. synaptic b. action c. equilibrium d. resting
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RECEPTOR POTENTIALS
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The Action Potential 1. Stimulus signal must be above threshold 2. Once above threshold: All--or-none 3. Non-decremental-- same size along the axon 4. Spike size independent of stimulus size 5. Spike frequency varies with stimulus size . 6 . The sign of the action potential is positive (+)
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THE AXON HILLOCK: I
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AT REST THE NEURON IS POLARIZED AT EQUILIBRIUM OUTSIDE +; INSIDE -
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DEPOLARIZATION The action potential: Neuron is depolarized There is a flow of current – towards +
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The fact that the action potential involves a depolarization and its sign is positive suggests the critical ion is ____ a.Sodium b. Calcium c. Potassium d. Chlorine
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HYPERPOLARIZE > NEGATIVE DEPOLARIZE > POSITIVE
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Unformatted text preview: During the absolute refractory period it is possible to elicit APs by increasing stimulus strength. a.True b.False Relative Refractory Period Absolute refractory Period The Action Potential 1. Stimulus signal must be above threshold 2. Once above threshold: All--or-none 3. Non-decremental-- same size along the axon 4. Spike size independent of stimulus size 5. Spike frequency varies with stimulus size . 6 . The sign of the action potential is positive (+) Increasing negativity is called _ and associated with____ Increasing positivity is called__ and associated with ____ a. hyperpolarization, Na+ b. hyperpolarization, Na+ c. depolarization, K+ d. hyperpolarization, K+ THE AXON HILLOCK: I DO CHANNELS EXIST? The evidence CONDUCTION OF THE NERVE IMPULSE The larger the stimulus the ____ the action potential a.More frequent b. faster c. Larger d. smaller The End...
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This note was uploaded on 09/20/2010 for the course PSYCH 180 taught by Professor Ziegler during the Fall '10 term at CUNY Hunter.

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psych180_lec5 - During the absolute refractory period it is...

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