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19 Cards in this Set
- Front
- Back
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Excitabilty/Conductivity is the ability to transmit nerve impulses to other neurons |
Conductivity |
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when a neuron is stimulated, the membrane becomes more permeable to Na+ ions, which diffuse into the cell and cause |
depolarization |
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As an action potential progresses, the permeability to Na+ decreases, and the permeability to this ion increase |
K+ |
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The period of time when the neuron is totally insensitive to further stimulation and cannot generate another action potential is |
absolute refractory period |
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what muscle and nerve will you need to isolate to study the physiology of nerve fibers? |
gastrocnemius and sciatic |
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period of depolarization of the neuron membrane during which it cannot respond to a second stimulus |
absolute refractory period |
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reversal of the resting potential due to an influx of sodium ions |
depolarization |
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period during which potassium ions diffuse out of the neuron because of a change in membrane permeability |
repolarization |
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period of repolarization when only a strong stimulus will elicit an action potential |
relative refractory period |
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mechanism in which ATP is used to move sodium out of the cell and potassium into the cell; restores the resting membrane voltage and intracellular ionic concentrations |
sodium-potassium pump |
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define the term depolarization |
when a neuron receives an excitatory stimulus the membrane becomes more permeable to sodium ions and Na+ diffuses down its electrochemical gradient. interior membrane becomes less negative. |
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how does an action potential differ from simple depolarization? |
action potential only occurs only if it reaches the threshold. depolarization can happen at any time. |
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would a substance that decreases membrane permeability to sodium increase or decrease the probability of generating an action potential? why? |
decrease membrane permeability is sodium, substance will decrease permeability through the membrane, no depolarization |
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name the three types of stimuli that resulted in action potential generation in the sciatic nerve of the frog |
mechanical, thermal, chemical |
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which of the stimuli resulted in the most effective nerve stimulation |
chemical |
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what is the usual mode of stimulus transfer in neuron-to-neuron interactions? |
chemical |
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since the action potentials themselves were not visualized with an oscilloscope during this initial set of experiments how did you recognize that impulses were being transmitted? |
muscle contraction |
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how did the site of action of ether and tubocurarine differ? |
difference is ether acts on the nerve, tubocurarine blocks the muscle |
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in the tubocurarine experiment, why was one of the frog's legs ligated? |
to keep tubocurarine from affecting the frog's other leg |
