Mastering Bio Ch. 27 Exam Questions
and Answers Graded A+
A neuron is at its resting potential when there are __________ - Correct answer-
more potassium ions inside the neuron than outside
What event occurs first during action potential? - Correct answer-sodium channels
open
What restores the distribution of ions inside and outside a neuron's membrane
following an action potential? - Correct answer-sodium-potassium pumps
During action potential, the inside of the neuron becomes ________ charged
relative to the outside - Correct answer-positively
The change in charge difference across the membrane spreads from open sodium
channels, causing sodium channels farther along the axon to open, causing an
_________ to be conducted along a neuron's axon - Correct answer-action
potential
In neurons, ____________ receive signals and ____________ transmit signals. -
Correct answer-dendrites, axons
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, The rapid reversal of ions across the plasma membrane of a neuron is known as
a(n) __________. - Correct answer-action potential
A switch is to a light, as a ____________________ is to an action potential. -
Correct answer-threshold
Water held behind a dam is similar to what aspect of a neuron? - Correct answer-
resting potential
If the dendrites are the "ears" of a neuron, and the axon is the "mouth" of the
neuron, what is the "cell body" analogous to? - Correct answer-brain
What neurons are part of the peripheral nervous system? - Correct answer-sensory
and motor
Using energy from ATP, _________ actively transport ions in both directions
across the membrane - Correct answer-sodium-potassium pumps
Some __________ are open, allowing certain ions to move out of the cell through
them - Correct answer-potassium channels
The ________ are closed, preventing certain ions from entering the cell through
them - Correct answer-sodium channels
The concentration of __________ is higher outside of the cell than inside - Correct
answer-sodium ions
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
and Answers Graded A+
A neuron is at its resting potential when there are __________ - Correct answer-
more potassium ions inside the neuron than outside
What event occurs first during action potential? - Correct answer-sodium channels
open
What restores the distribution of ions inside and outside a neuron's membrane
following an action potential? - Correct answer-sodium-potassium pumps
During action potential, the inside of the neuron becomes ________ charged
relative to the outside - Correct answer-positively
The change in charge difference across the membrane spreads from open sodium
channels, causing sodium channels farther along the axon to open, causing an
_________ to be conducted along a neuron's axon - Correct answer-action
potential
In neurons, ____________ receive signals and ____________ transmit signals. -
Correct answer-dendrites, axons
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, The rapid reversal of ions across the plasma membrane of a neuron is known as
a(n) __________. - Correct answer-action potential
A switch is to a light, as a ____________________ is to an action potential. -
Correct answer-threshold
Water held behind a dam is similar to what aspect of a neuron? - Correct answer-
resting potential
If the dendrites are the "ears" of a neuron, and the axon is the "mouth" of the
neuron, what is the "cell body" analogous to? - Correct answer-brain
What neurons are part of the peripheral nervous system? - Correct answer-sensory
and motor
Using energy from ATP, _________ actively transport ions in both directions
across the membrane - Correct answer-sodium-potassium pumps
Some __________ are open, allowing certain ions to move out of the cell through
them - Correct answer-potassium channels
The ________ are closed, preventing certain ions from entering the cell through
them - Correct answer-sodium channels
The concentration of __________ is higher outside of the cell than inside - Correct
answer-sodium ions
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
