The rising phase of the action potential is due to:Na+ influx through voltage-gated Na+ channels.Na+ efflux through voltage-gated Na+ channels.K+ influx through voltage-gated K+ channels.K* efflux through voltage-gated K+ channels.O Na+ influx through Na+ leak channels.Na efflux through Na+ leak channels.K+ influx through K+ leak channels.O K+ efflux through K+ leak channels.

Introduction An electrical signal called an action potential passes briefly over the membrane of a…

The rising phase of the action potential is due to: O Na+ influx through voltage-gated Na+ channels. O Na+ efflux through voltage-gated Na+ channels. OK* influx through voltage-gated K+ channels. OK* efflux through voltage-gated K+ channels. O Nat influx through Nat leak channels. O Nat efflux through Nat leak channels. OK* influx through K+ leak channels. K+ efflux through K+ leak channels.

The rising phase of the action potential is due to: O Na+ influx through voltage-gated Na+ channels. O Na+ efflux through voltage-gated Na+ channels. OK* influx through voltage-gated K+ channels. OK* efflux through voltage-gated K+ channels. O Nat influx through Nat leak channels. O Nat efflux through Nat leak channels. OK* influx through K+ leak channels. K+ efflux through K+ leak channels.

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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Draw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.
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?
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.
Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed
A neuron responds to adequate stimulation with _______, a type of self-propagating signal.
Which of the following is NOT true regarding the changes that occur during an action potential. Check All That Apply When stimulus is sufficient to cause the threshold potential to be reached, the area stimulated opens its voltage-gated sodium channels.When stimulus is sufficient to cause the threshold potential to be reached, the area stimulated opens its voltage-gated sodium channels. After threshold is reached, the sodium ions move into the cell via the Na+/K+ pump, the inside of the cell becomes momentarily positive.After threshold is reached, the sodium ions move into the cell via the Na+/K+ pump, the inside of the cell becomes momentarily positive. At almost the same time as Na+ channels are closing, voltage-gated potassium channels open, allowing an increased movement of potassium ions out of the cellAt almost the same time as Na+ channels are closing, voltage-gated potassium channels open, allowing an increased movement of potassium ions out of the cell The…
Which of the following is FALSE about action potentials? At resting potential, there are more potassium channels open and most sodium channels are closed. Depolarization is due to the flow of Na+ out of the axon via voltage-gated Na+ channels. Hyperpolarization is due to continued loss of K+ from the axon. During repolarization, K+ flows out of the axon along its concentration gradient. Resting membrane potential is primarily established by the Na+/K+ pump.
What membrane protein of the neuron is responsible for briefly increasing the Na+ permeability of the membrane during the rising phase of the nerve impulse? the sodium-potassium pump the voltage gated potassium channel the voltage gated sodium channel the stimulus gated sodium channel the ligand gated ion channels
In an experiment, the extracellular [Na+] surrounding a nerve cell was reduced from 145 to 45 mM. Which of the following is the most likely effect of this on action potentials? No action potentials would occur because the concentration of extracellular Na+ is too low. The membrane potential would become more negative so the threshold for action potential generation could not be reached. The nerve cell would still produce an action potential but its amplitude would be reduced and the depolarisation phase would be slower. The nerve cell would still produce an action potential but its amplitude would be reduced and the depolarization phase would be more rapid.
What is responsible for action potentials propagating in one direction? The inactivation of voltage gated sodium channels The sodium potassium pump and the potassium leak channels The inactivation of voltage gated potassium channels The inactivation of ligand gated sodium channels The inactivation of ligand gated potassium channels
An influx of positive sodium ions causes opening of the activation gates of voltage regulated sodium channels resulting in a further influx of positive sodium ions, and thus the initial stages of an action potential are regulated by ______ feedback.
An influx of positive sodium ions eventually causes closing of the inactivation gates of voltage regulated sodium channels, stopping the influx of positive sodium ions, and thus the final stages of an action potential are regulated by _____ feedback.