Multiple Choice
_____ is the release of a neural impulse, consisting of a reversal of the electrical charge within the axon.
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3. Biological Psychology
Communication in the Nervous System
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Which of the follow statements about action potentials are true?
I) A neuron’s resting potential is -55 mV.
II) An all-or-nothing response means once the threshold is reached, the action potential will fire.
III) The refractory period means there is a time where the neuron can’t fire.
A
I & II only.
B
I & III only.
C
II & III only.
D
I, II, & III.
Verified step by step guidance1
Understand the concept of a neuron's resting potential: A typical neuron's resting potential is around -70 mV, not -55 mV. This is the electrical charge difference across the neuron's membrane when it is not actively sending a signal.
Examine the all-or-nothing response: This principle states that once the threshold potential is reached (usually around -55 mV), the neuron will fire an action potential. This is a true statement.
Consider the refractory period: This is the time after an action potential during which a neuron is unable to fire another action potential. This is also a true statement.
Evaluate statement I: Since the resting potential is not -55 mV, statement I is false.
Determine the correct combination: Based on the analysis, statements II and III are true, making the correct answer 'II & III only.'
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