Nurses Need Physiology: Hyperkalemia and Excitable Tissues 13 of 20 +30 +30 thre

Question

Nurses Need Physiology: Hyperkalemia and Excitable Tissues 13 of 20 +30 +30 threshold lower 70 70- depolarizes Time (msec) Time (msec) When extracellular K is slightly elevated, will leave the nerve cell when it is repolarizing, ??. repolarizes When extracellular K is normal, the nerve normally and returns to its original and as a result the cell will stabilize at a resting potential that is This resting poten Since a cell fires when its potential reaches than normal. this cell will fireeasily The patient will experience cramps and tingling.

Explanation / Answer

When extracellular K+ is normal, the nerve repolarizes normally and returns to its original resting potential.

When extracellular K+ is slightly elevated, less K+ will leave the nerve cell when it is repolarizing, and as a result the cell will stabilize at a resting potential that is higher than normal.The resting potential is closer to threshold. Since a cell fires when its potential reaches threshold, this cell will fire more easily. The patient will experience cramps and tingling.

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