What would happen to action potentials in the brain if a drug blocking ATP were immediately introduced into the system? Depolarization will not occur O The resting potential will be immediately abolished without a functioning Na+/K+ pump Repolarization will not occur O Action potentials will continue to work until the electrochemical gradient is abolished One action potential will occur, but subsequent action potentials will not because the Na+/K+ pump cannot restore the ion gradient

What would happen to action potentials in the brain if a drug blocking ATP were immediately introduced into the system? Depolarization will not occur O The resting potential will be immediately abolished without a functioning Na+/K+ pump Repolarization will not occur O Action potentials will continue to work until the electrochemical gradient is abolished One action potential will occur, but subsequent action potentials will not because the Na+/K+ pump cannot restore the ion gradient

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter35: The Nervous System

Section: Chapter Questions

Problem 2VCQ: Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to...

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Saltatory conduction (a) requires more energy than continuous conduction (b) occurs in unmyelinated neurons (c) occurs when the action potential jumps from one node of Ranvier to the next (d) slows transmission of an impulse (e) depends on the action of GABA
Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?
Explain how the changes in Na+ and K+ ion concentrationsthat occur during an action potential are associated withdepolarization and repolarization.
The resting membrane potential of a neuron or muscle cell is a. equal to the potassium equilibrium potential. b. equal to the sodium equilibrium potential. c. somewhat less negative than the potassium equilibrium potential. d. somewhat more positive than the sodium equilibrium potential. e. not changed by stimulation.
IPSP differs from EPSP in :-a- being of shorter durationb- being unable o summate spatiallyc- moving the membrane potential away from thresholdd- depending upon opening of voltage K + channels
At the membrane of an axón, the action potential is -60 mV for K+ ions. Calculate de external and internal concentration radios.
Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
A drug that binds with the receptor that the neurotransmitter binds with and opens ion channels is an example of a(n) _______. synergist antagonist agonist protagonist
Ordinarily, a neuron’s trigger zone is activated before any other part ofan axon, so a wave of action potentials occurs as sodium channelsopen in the direction of the synaptic terminal. What would happen ifyou artificially stimulated an axon to reach threshold potential midwayalong its length rather than at the trigger zone?a. Action potentials would occur in the direction of the synapticterminal.b. No action potentials would occur.c. Action potentials would occur in the direction of the trigger zone.d. Both a and c are correct.
Based upon the changes in permeability seen in the trace below and your knowledge of ion distributions across a cell, predict how ion movements would change during an action potential. Drag and drop each phrase into the appropriate box on the action potential trace. Drag the appropriate labels to their respective targets. Note: not all labels will be used. ►View Available Hint(s) Sodium (Na+) ions move to the axon Sodium (Na) ions move out of the axon Less potassium (K) ions move out of the axon Potassium (K) ions move out of the axon Potassium (K¹) ions move into the axon Sodium (Na) ions stop moving in Membrane potential (mv) +30 +10 0 -10- -30 -50 -70 -90 A PNa 0 PNa 5 6 1 PK Threshold PK 2 Reset Help
For a neuron to fire an action potential, its membranemust reach ________.a. hyperpolarizationb. the threshold of excitationc. the refractory periodd. inhibitory postsynaptic potential
Suppose that gated ion channels for Na+or Ca2+ opened in the plasma membrane of a muscle cell.The membrane potential of that cell would a. move toward the equilibrium potential for that ion. b. become less negative than the resting membrane potential. c. move farther away from the potassium equilibrium potential. d. all of these.