The maintenance of homeostasis in biological systems is critical for the survival of organisms. A major mechanism through which cells maintain homeostasis is through the regulation of water movement across their membranes. This process is largely dependent on the characteristics of the cell membrane, which is selectively permeable.
Consider the movement of water through a cell's membrane in response to solute concentration differences. When a cell is placed in a hypertonic solution, the concentration of solutes outside the cell is greater than that inside. Conversely, in a hypotonic solution, the concentration of solutes outside the cell is lower than that inside. In an isotonic solution, the concentrations are equal.
Which of the following statements correctly describes the movement of water when a cell is placed in a hypertonic solution?