Part A Neuron J has a resting membrane potential of -70mV and a threshold value
ID: 312016 • Letter: P
Question
Part A
Neuron J has a resting membrane potential of -70mV and a threshold value of -50mV. Neuron K releases neurotransmitter onto Neuron J, which causes a 20mV depolarization at the axon hillock. Neuron L causes a 10mV hyperpolarization at the axon hillock. In which of the following scenarios would an action potential be generated at Neuron J's axon?
Neuron J has a resting membrane potential of -70mV and a threshold value of -50mV. Neuron K releases neurotransmitter onto Neuron J, which causes a 20mV depolarization at the axon hillock. Neuron L causes a 10mV hyperpolarization at the axon hillock. In which of the following scenarios would an action potential be generated at Neuron J's axon?
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Neuron K and Neuron L each fire once, simultaneously. Neuron K fires once. Neuron L fires once.Explanation / Answer
Neuron K fires once is the correct answer. Action potential is all or none phenomenon. If the threshold value has reached then it will release neurotransmitter otherwise it doesnt.
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