Question

Which of these most likely occurred to change a muscle fiber's membrane potential from -90 mV...

Which of these most likely occurred to change a muscle fiber's membrane potential from -90 mV to -95 mV?

1. More negatively charged ions left the cytosol than entered the cell.

2. More positively charged ions left the cytosol than entered the cell.

3. More negatively charged ions entered the cytosol than left the cell.

4. More positively charged ions entered the cytosol than left the cell

Science   Anatomy-And-Physiology   
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Answer #1

Ans . 2. More positive charged ion left the CYTOSOL than entered

This phenomenon is called hyperpolarization .

During propagation of action potential.

At stage 2 repolarization occurs that is K + ion moving out to cell to Action potential below threshold level .relaxation stage of muscle .

But when K+ channels remains opens the potential goes more negative from -90 to -95 .

Result in hyperpolarization stage 3 .

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