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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Describe how the following stages occur in a neuron in terms of ion movement across the cell membrane: resting potential, threshold potential, depolarization, repolarization.
1. an electrochemical event (called an action potential) that uses cell energy and electrical charges to generate current 2. Slower than electricity through a wire but no resistance ie. nerve impulses are as strong at the end of the neuron as at the start 3. the neuron membrane is semi permeable to ions eg. Na+, K+, Cl- 4. an electrical potential difference occurs when ions become unequally distribued 5. when the neuron is at rest unstimulated, the inside has -ve charge versus the +ve outside ie. a potential difference of -70mV exists inside (called the resting membrane potential) 6. the axon is polarized (ie. a charged membrane caused by unequal distribution of +ve charges and by immobile -ve charged proteins trapped inside axon)

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