Action potential Flashcards

1
Q

1

A

steady resting membrane potential is near Ek, due to leaky K+ channels

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2
Q

2

A

action potential begins with a depolarising stimulus, bringing the membrane potential to the threshold level (aprox -60). Depolarisation becomes a positive feedback loop, opening more Na+ channels

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3
Q

3-overshoots

A

Membrane potential overshoots, Ek approaches Pna

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4
Q

4-reaches peak

A

Na+ permeability rapidly declines as channels are blocked (inactivation) delayed opening of K+ halts membrane depolarisation

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5
Q

5- repolarisation

A

outward current through K+ channels brings membrane potential closer to original, negative potential.

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6
Q

6-hyperpolarised

A

current through slowly closing K+ channels hyperpolarises membrane.

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7
Q

7

A

closure of K+ channels returns membrane to resting potential.

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