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Questions and Answers
What is the threshold potential at which an action potential starts to occur?
What is the threshold potential at which an action potential starts to occur?
- -20 mV
- -50 mV
- +20 mV
- +30/40 mV (correct)
What happens to the membrane potential during the falling phase of an action potential?
What happens to the membrane potential during the falling phase of an action potential?
- It fluctuates randomly
- It becomes more negative (correct)
- It remains the same
- It becomes more positive
What is the role of the Na+/K+ transporters in the recovery phase of an action potential?
What is the role of the Na+/K+ transporters in the recovery phase of an action potential?
- To maintain the action potential
- To pump K+ ions into the cell
- To pump Na+ ions out of the cell
- To restore the resting potential (correct)
What happens to the voltage-gated Na+ channels during the peak of an action potential?
What happens to the voltage-gated Na+ channels during the peak of an action potential?
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What is the state of the membrane during the refractory period?
What is the state of the membrane during the refractory period?
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What is the resting membrane potential of a neuron?
What is the resting membrane potential of a neuron?
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