During intense
exercise, potassium tends to accumulate in the
fluid surrounding muscle cells. what membrane
protein muscle cells counteract this
tendency? explain your answer.

Sodium ion

Explanation:

A sodium/potassium ion channel protein would help the muscle cells counteract this tendency by pumping potassium (K+) into the cell and sodium (Na+) out. This raises the concentration of K+ ions within the axoplasm relative to the outside causing the Na+ ions to diffuse out. This is the resting potential

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