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exercise_nervous_I_topic_5 - b Does K move into or out of...

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The Nervous System: The Action Potential 1. a. The action potential changes the membrane potential from _______ mV (resting) to _______ mV and back again to the resting membrane potential. b. This results from a change in membrane permeability first to _______ then to _______ due to the opening of what type of ion channels? _____________________________________ 2. a. Where is the density of voltage-gated Na + channels the greatest? __________________ b. What areas of the neuron generate signals that open these voltage-gated channels? __________________________________________ c. Opening of these channels causes the membrane to __________________ (voltage change). 3. a. If the membrane reaches the trigger point, known as __________________, what electrical potential will be generated? __________________________________________ b. During the depolarization phase, voltage-gated __________ channels open and _______ enters the cell. 4. What are the two processes that stop the potential from rising above +30 mV? a. b. 5. a. The opening of voltage-gated K + channels cause the membrane to _____________________.
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Unformatted text preview: b. Does K + move into or out of the cell? __________________ c. If the membrane potential becomes more negative than –70 mV, this is called _________. d. This potential is caused by what characteristic of K + permeability? __________________________________________ 6. a. After an action potential, the neuron cannot generate another action potential because _______ channels are inactived. This period is called the _______________________ period. b. During the ______________________ period, the cell can generate another action potential but only if the membrane is ___________ (more or less) depolarized. 7. a. Conduction velocity along the axon is increased by what two characteristics? 1. ________________________________ 2. ________________________________ b. Conduction along a myelinated axon is called __________________________ conduction. 8. a. Name the disease whose symptoms include loss of vision and increasing muscle weakness: __________________________(from the quiz section) b. What does this disease destroy? ________________________________ c. How does this stop an action potential?...
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