Question

All but one factor plays a part in water movement in and out of the cell. That is A) the presence of sodium potassium pumps. B) the concentration of solutes inside the cell. C) the concentration of solutes outside the cell. D) the concentration of water in and out of the cell.

Answer 1

The Answer is A. The presence of sodium potassium pumps has nothing to do with water moving in and out of cells.

Answer 2

The right answer is A.

Solutes have an influence on the water distribution inside and outside the cell, exerting an osmotic pressure.

The sodium-potassium or Na+ -K+ ATPase pump is a transmembrane protein whose enzymatic activity uses energy derived from the degradation of ATP to ADP and inorganic phosphate to transport K+ and Na+ against their concentration gradient. It plays a role in maintaining the resting potential of nerve, muscle and cardiac cells. The pump is used to exchange sodium ions (Na +) from the intracellular medium with K + potassium ions from the extracellular medium in a precise ratio (3 Na + / 2 K +). This pump is responsible for restoring the initial balance after an action potential.

Although the sodium ore itself has an influence on the water distribution by exerting osmotic pressure, the action of the Na-K pump does not influence it directly, it will just keep the most of sodium ions outside the cell.