18 Questions
What is the resting potential of a neuron?
-70 mV
What happens to the membrane potential when the Na+ channels open?
It becomes more positive
What is the purpose of the Na+/K+ pump?
To bring the membrane back to its resting state
What happens during the repolarization phase?
The membrane potential becomes more negative
What is the purpose of the refractory period?
To prevent the neuron from receiving another stimulus during this time
What is the All-Or-Nothing principle in nerve conduction?
The action potential either occurs fully or not at all
What is the primary function of action potentials in nerve cells?
To transmit nerve signals or impulses
During which phase of the action potential do Na+ channels open and Na+ floods into the neuron?
Depolarization
What is the term for the period during which no impulses can pass along a part of the membrane?
Refractory period
What is the purpose of active pumping of Na+ out and K+ in during the hyperpolarization phase?
To maintain the resting potential of the neuron
What is the change in membrane polarity that occurs during an action potential?
A sudden reversal of membrane polarity
What is the membrane potential at the threshold?
-55 mV
What is the term for the process by which action potentials rapidly jump from node to node in myelinated nerve fibers?
Saltatory conduction
What factor other than myelination influences the speed of action potential transmission?
Diameter of the axon
What type of potential is generated by a weak subthreshold stimulus?
Graded potential
What is the term for a graded potential that makes the membrane more polarized (inside more negative)?
Hyperpolarizing graded potential
What is the term for the movement of ions across the neuron membrane that generates an action potential?
Depolarization
What is the term for the period during which a neuron is unable to generate another action potential?
Refractory period
Understand the successive stages of the action potential, from the resting stage to depolarization and repolarization, and learn about the role of voltage-gated Na+ channels. Test your knowledge of this crucial concept in physiology and neuroscience!
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