Multiple Choice
In humans, making more serotonin available to brain cells typically __________.
45. Nervous System
Neurons and Action Potentials
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Action potentials are generated along a neuron because __________.
A
of cytoplasmic streaming within the neuron
B
they are pulled along by positive-negative attraction
C
the neuron cytoskeleton conducts electricity as long as an ion gradient is maintained by the sodium-potassium pump
D
All of the listed responses are correct.
E
depolarization of the membrane at one point causes an increase of permeability to sodium at the next point
Verified step by step guidance1
Understand that an action potential is a rapid change in membrane potential that travels along the axon of a neuron.
Recognize that the generation of an action potential involves depolarization, where the inside of the neuron becomes less negative compared to the outside.
Identify that depolarization at one point on the neuron membrane causes voltage-gated sodium channels to open, increasing the permeability to sodium ions at the next point.
As sodium ions enter the neuron, the membrane potential becomes more positive, which triggers the opening of more sodium channels further along the axon, propagating the action potential.
This process continues along the length of the neuron, allowing the action potential to travel from the cell body to the axon terminals.
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