What is an action potential?

Physiology Flashcards

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Science
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University
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Hard
Javier Buenrostro
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27 questions
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1.
FLASHCARD QUESTION
Front
Back
A rapid, all-or-nothing electrical signal that travels along the neuron's axon.
2.
FLASHCARD QUESTION
Front
What triggers an action potential?
Back
It is triggered when the membrane potential reaches a certain threshold.
3.
FLASHCARD QUESTION
Front
What happens during depolarization in an action potential?
Back
Sodium (Na⁺) channels open, and Na⁺ rushes in, making the inside of the cell more positive.
4.
FLASHCARD QUESTION
Front
What happens during repolarization in an action potential?
Back
Potassium (K⁺) channels open, and K⁺ exits, making the inside of the cell negative again.
5.
FLASHCARD QUESTION
Front
What happens during hyperpolarization in an action potential?
Back
The membrane potential drops below the resting potential briefly before stabilizing.
6.
FLASHCARD QUESTION
Front
What is a graded potential?
Back
A small, localized change in membrane potential that varies in size and can be excitatory or inhibitory.
7.
FLASHCARD QUESTION
Front
Where do graded potentials occur in a neuron?
Back
Graded potentials occur in the dendrites and cell body.
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