The sarcolemma of a resting muscle fiber is most permeable to __________.
A) calcium
B) potassium
C) sodium
D) lithium
E) magnesium

Question

Quizplus · Accepted Answer

The resting sarcolemma has the highest permeability to potassium ions. This is because there are more potassium leak channels than any other type of channel in the sarcolemma. This allows for a small amount of potassium to leak out of the cell, creating a negative charge inside the cell that helps maintain the resting membrane potential.

The Sarcolemma of a Resting Muscle Fiber Is Most Permeable