Answer:
A and C
Explanation:
The sodium - potassium pump is the responsible to allow water to enter or go outside the cell, both ions work together but in different directions, meanwhile one goes to the inside to the cell, the other, tend to go outside.
If there is an equilibrium among them, the water concentration inside the cell stays also in equilibrium, but during exercise or by a sickness the lost of ions need to be recover, if not it will lead in a muscle contraction.
