During the resting state, a neuron is: polarized with sodium ions outside the cell and potassium ions inside the cell restoring the ionic conditions utilizing the sodium-potassium pump depolarizing and generating an action potential propagating the action potential repolarizing as potassium ions diffuse out of the cell

During the resting state, a neuron is: polarized with sodium ions outside the cell and potassium ions inside the cell restoring the ionic conditions utilizing the sodium-potassium pump depolarizing and generating an action potential propagating the action potential repolarizing as potassium ions diffuse out of the cell

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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When action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.
A neuron responds to adequate stimulation with _______, a type of self-propagating signal.
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?
The accelerating flow of _______ ions through gated channels across the membrane triggers an action potential. a. potassium b. sodium c. hydrogen d. a and b
The membrane potential caused by differences in ions across the plasma membrane of an electrically excitable cell (when not stimulated) is called: action potential resting membrane potential graded potential local potential
The changes in membrane potential when a neuron is transmitting information is called ..... threshold action potential chemical potential resting potential
The threshold of excitation is the voltage level at which ________ an excitatory postsynaptic potential can be measured an action potential is triggered a decrease in the rate of action potentials occurs potassium channels close
Which of the following phases of an action potential is correctly matched with the changes in ion movement and membrane potential? All of these are correctly matched. Phase 1 – sodium movement into the cell Phase 3 – potassium movement into the cell Phase 2 – sodium movement out of the cell
Which of the following describes a threshold potential? A brief reversal of the charge difference across a neuron's plasma membrane The membrane potential at which voltage-gated sodium channels in a neuron axon open, causing an action potential The membrane potential of a neuron at rest
If the neuron is stimulated such that its membrane potential changes to 50 mV, what is the sign of the driving force for Cl- ions and in which direction will these ions move across the membrane? Positive driving force; Cl- moves into the cell Positive driving force; Cl- moves out of the cell Negative driving force; Cl- moves into the cell Negative driving force; Cl- moves out of the cell
After an action potential, the opening of voltage-gated ________ channels and the inactivation of sodium channels, cause the membrane to return to its resting membrane potential. disodium potassium calcium chloride acetylcholine
Which of the following can increase the likelihood of a neuron generating an action potential? tetrodotoxin (TTX) reducing the external concentration of K+ decreased diffusion of K+ through leak channels out of the neuron All of the above