Action Potentials

Flashcard
•
Science, Biology
•
10th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an action potential?
Back
An action potential is a rapid, temporary change in the electrical membrane potential of a neuron, allowing it to transmit signals.
2.
FLASHCARD QUESTION
Front
What role does the sodium-potassium pump play in neurons?
Back
The sodium-potassium pump uses ATP to move sodium ions out of the cell and potassium ions into the cell, maintaining the resting membrane potential.
3.
FLASHCARD QUESTION
Front
What happens during depolarization?
Back
During depolarization, the membrane potential becomes less negative (more positive) due to the influx of sodium ions through sodium channels.
4.
FLASHCARD QUESTION
Front
What is repolarization in the context of action potentials?
Back
Repolarization is the process of returning the membrane potential to its resting state after depolarization, primarily through the efflux of potassium ions.
5.
FLASHCARD QUESTION
Front
Define polarity in the context of neurons.
Back
Polarity refers to the difference in charge across the neuronal membrane, with the inside being negatively charged relative to the outside.
6.
FLASHCARD QUESTION
Front
What is the significance of the threshold potential?
Back
The threshold potential is the critical level to which a membrane potential must be depolarized to initiate an action potential.
7.
FLASHCARD QUESTION
Front
What occurs during the refractory period?
Back
During the refractory period, a neuron cannot fire another action potential, ensuring that signals only travel in one direction.
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