resting potential Flashcards

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1
Q

what is the potential difference when a neuron is in its resting state

A

the inside is more negative and the outside is more positive

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2
Q

how can the membrane be described as being in its resting state

A

polarised

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3
Q

what is the resting potential

A

-70mv

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4
Q

what is the resting potential created and maintained by

A

sodium potassium pumps and potassium channels

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5
Q

how does the sodium potassium pump maintain a resting potential

A

use active transport (ATP) to move three Na+ ions out of the cell and two K+ ions into the cell via a carrier protein

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6
Q

how is a sodium electrochemical gradient established

A

the membrane isnt permeable to sodium ions so they cannot diffuse back in, creating an electrochemical gradient as there are more Na+ ions outside than inside

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7
Q

how does potassium channels regulate resting potential

A

allow facilitated diffusion out of the neuron down their concentration gradient after entering via the sodium potassium pump

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