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

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

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter13: The Nervous System

Section: Chapter Questions

Problem 3SQ: When action potentials arrive at a synapse between a neuron and another cell, they stimulate the...

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Question

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

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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.
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.
The stage of the action potential that is shown below is ____________ the very end of the action potential repolarization resting potential depolarization
A/An _____ synapse is formed when a presynaptic neuron synapses with the cell body of a postsynaptic neuron
The change in the electrical balance between the intra- and extra-cellular fluid that occurs when a neuron sends a message is called the _________________ potential. action resting electrical synaptic
the refractory period limits the number .40 of action potentials that a given nerve cell can produce per unit time True O False O
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.
At __________ synapses, neurotransmitters hyperpolarize the membrane, by making it more permeable to K+ or moving membrane potential away from threshold (hyperpolarizing), and making generation of an action potential less likely; these are inhibitory postsynaptic potentials (EPSPs).
Action potentials are produced by voltage-gated channels True False
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
Blocking KCa2 (SK) channels will typically ________ a neuron's firing rate Increase Decrease Not change
[Na*] [K*] This diagram is a drawing of normal conditions that occur in a neuron's axon (not all details are included). This stage that a living neuron would be in, would show that O no positive ions are inside the cell current is traveling down the axon O the cell will be at rest once the Na ions enter the cell O the cell is at rest O Na ions are predominantly outside the cell