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Questions and Answers
What is the resting potential of a neuron?
What is the resting potential of a neuron?
- -70 mV (correct)
- -90 mV
- -110 mV
- -50 mV
What happens to the membrane potential when the Na+ channels open?
What happens to the membrane potential when the Na+ channels open?
- It becomes more negative
- It remains the same
- It becomes zero
- It becomes more positive (correct)
What is the purpose of the Na+/K+ pump?
What is the purpose of the Na+/K+ pump?
- To prevent the neuron from receiving another stimulus
- To close voltage-gated channels
- To open voltage-gated channels
- To bring the membrane back to its resting state (correct)
What happens during the repolarization phase?
What happens during the repolarization phase?
What is the purpose of the refractory period?
What is the purpose of the refractory period?
What is the All-Or-Nothing principle in nerve conduction?
What is the All-Or-Nothing principle in nerve conduction?
What is the primary function of action potentials in nerve cells?
What is the primary function of action potentials in nerve cells?
During which phase of the action potential do Na+ channels open and Na+ floods into the neuron?
During which phase of the action potential do Na+ channels open and Na+ floods into the neuron?
What is the term for the period during which no impulses can pass along a part of the membrane?
What is the term for the period during which no impulses can pass along a part of the membrane?
What is the purpose of active pumping of Na+ out and K+ in during the hyperpolarization phase?
What is the purpose of active pumping of Na+ out and K+ in during the hyperpolarization phase?
What is the change in membrane polarity that occurs during an action potential?
What is the change in membrane polarity that occurs during an action potential?
What is the membrane potential at the threshold?
What is the membrane potential at the threshold?
What is the term for the process by which action potentials rapidly jump from node to node in myelinated nerve fibers?
What is the term for the process by which action potentials rapidly jump from node to node in myelinated nerve fibers?
What factor other than myelination influences the speed of action potential transmission?
What factor other than myelination influences the speed of action potential transmission?
What type of potential is generated by a weak subthreshold stimulus?
What type of potential is generated by a weak subthreshold stimulus?
What is the term for a graded potential that makes the membrane more polarized (inside more negative)?
What is the term for a graded potential that makes the membrane more polarized (inside more negative)?
What is the term for the movement of ions across the neuron membrane that generates an action potential?
What is the term for the movement of ions across the neuron membrane that generates an action potential?
What is the term for the period during which a neuron is unable to generate another action potential?
What is the term for the period during which a neuron is unable to generate another action potential?
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