Question

question 46
the inside of a resting muscle cell has more _______ ions when compared to the outside.
a sodium
b calcium
c magnesium
d potassium

Explanation:

In a resting muscle cell, the sodium - potassium pump actively transports sodium ions (\(Na^{+}\)) out of the cell and potassium ions (\(K^{+}\)) into the cell. As a result, the concentration of potassium ions is higher inside the resting muscle cell compared to the outside. Calcium ions (\(Ca^{2+}\)) are sequestered in the sarcoplasmic reticulum in a resting muscle cell. Magnesium ions (\(Mg^{2+}\)) are not the major ions with a higher concentration inside the resting muscle cell compared to the outside in the context of the basic resting membrane potential ion distribution. Sodium ions have a higher concentration outside the resting muscle cell.

Answer:

D. potassium