Jerry was found on the floor nearly unconscious. 911 was called and he was rushe

Question

Jerry was found on the floor nearly unconscious. 911 was called and he was rushed to the
hospital emergency department. Blood tests revealed Jerry had hyperkalemia (higher than normal blood
potassium ion concentration). An electrocardiogram (EKG) revealed that Jerry’s heart was not functioning
normally and he had a lower than normal heart rate.
During the hyperkalemia, were Jerry’s cells closer to or further from threshold compared to a normal
person (or compared to Jerry’s cells before the hyperkalemia)?
A. closer to
B. further from

This may be tough!! Severe hyperkalemia can cause a lack of excitability of cells and can decrease the ability of the cell to produce action potentials. A. True B. False

Now you are asked by your superior about causes of hyperkalemia. You now desperately want to look smart. You correctly tell your superior that hyperkalemia can be caused by A. Addison’s disease (with below normal aldosterone secretion) B. Hyperaldosteronism or Conn’s syndrome (with above normal aldosterone secretion)

Explanation / Answer

1. Correct answer:- closer to

2 correct answer:- true

Explanation:-  hyperkalemia, because neurons are closer to threshold, neurons at initially are more excitable than normal.But with severe hyperkalemia, Na+channels remain inactivated, the membrane Na+channels cannot “reset” toallow new action potentials to occur, and there is a decrease in excitability (and a decrease inthe ability to produce action potential.

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