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11 Cards in this Set
- Front
- Back
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match to the statement to the phase |
resting potential repolarisation hyper polarisation nerve transmission depolarisation |
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the resting potential is -70mV |
resting potential |
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the sodium channels close. the potassium ion channels open and let the potassium ions out the cell, this makes the inside of the cell more negative again |
repolarisation |
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the membrane is, more permeable to potassium (k+) ions than sodium (Na+). for every three sodium ions actively transported across the membrane, only 2 potassium ions are actively transported. this process requires ATP. |
resting potential |
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some of the potassium ions diffuse back in through leaky ion channels and restores the resting potential |
repolarisation |
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potassium ion channels close more slowly than sodium ions excess potassium ions diffuse out of the neutron this leads to the potential difference to be greater than -70mV |
hyperpolarisation |
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a wave of depolarisation continues down the axon carrying the nerve impulse |
nerve transmission |
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there are more sodium ions outside of the cell. Na+ floods into the cytoplasm down the concentration gradient |
depolarisation |
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at the rest the neuron is transporting Na+ and K+ ions across its membrane. the inside of the neutron is more negatively charged compared to the outside |
resting potential |
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the inside of the neuron is now more positive than the outside the potential difference is +40mV |
action potential |
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when there is a nerve impulse, sodium ion channels in the cell membrane open. this makes the membrane more permeable to sodium ions |
depolarisation |
