e nurse taking Mr. M\'s vitals asks him about his tiredness. \'Do you ever have

Question

e nurse taking Mr. M's vitals asks him about his tiredness. 'Do you ever have trouble balancing or walking? Do you drop things? And have you noticed any tingling or cramping?" y you should ask," he says. 'Last week I was having all kinds of foot cramps and twitches. But this week, that's all gone. Sometimes at night I'm so tired I can hardly stand up. And I just told my daughter I had the dropsy - I drop g I touch." let's check your reflexes. Mr. M's reflexes are slow and weak. all the things the nurse could have checked, why reflexes? When you ask her, she says "That story about cramps and twitches last week and his weakness today - I'm worried about his potassium levels. With renal failure, he can't it out of his blood properly." what does potassium have to do with cramps and reflexes? Let's review the normal process of nerve and skeletal muscle firing. Here is a graph of nerve firing. Drag the descriptions of what is happening into the proper places on the graph. Reset Help to sodium The cell reaches If it is a muscle cell, this will begin the process of contraction Sodium channels close positive sodium enters and action potential +30 ow no more can negative ut can leave. As leaves the cell it decreases becomes more sodium leaves sodium channels

Explanation / Answer

The cell reaches action potential , if it is a muscle cell this will begin the process of contraction.

potassium and sodium channels open

Now no more sodium can enter the cell but potassium can leave

as potassium leaves the cell it becomes more depolarized positive

As a stimulus opens sodium channels, the cell's potential decreases and it depolarizes causing sodium channels to close

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