Multiple Choice
If the membrane potential of a neuron decreases, the membrane potential _____.
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45. Nervous System
Neurons and Action Potentials
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Which factor primarily determines whether a neuron will generate an action potential?
A
The amount of neurotransmitter stored in synaptic vesicles
B
Whether the membrane potential reaches the threshold value
C
The presence of myelin around the axon
D
The number of dendrites present on the neuron
Verified step by step guidance1
Understand the concept of an action potential: An action potential is a rapid electrical signal that travels along the axon of a neuron. It is triggered when the neuron's membrane potential reaches a specific threshold value.
Review the role of the membrane potential: The membrane potential is the difference in electrical charge across the neuron's membrane. It is influenced by the movement of ions (e.g., Na⁺ and K⁺) through ion channels.
Identify the threshold value: The threshold is a critical membrane potential value (usually around -55 mV in many neurons) that must be reached for voltage-gated sodium channels to open, initiating the action potential.
Eliminate irrelevant factors: The amount of neurotransmitter stored in synaptic vesicles, the presence of myelin, and the number of dendrites do not directly determine whether an action potential is generated. These factors may influence other aspects of neuronal function but not the initiation of an action potential.
Conclude that the primary factor is whether the membrane potential reaches the threshold value, as this directly determines the generation of an action potential.
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