Water Transport Across Cell Membranes

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions. One of the key mechanisms involved in homeostasis is the regulation of water and solute concentrations in bodily fluids.

This regulation is primarily achieved through the function of cell membranes which allow selective transport of substances. Water can move across cell membranes through special proteins called aquaporins. Understanding the role of these mechanisms is crucial for grasping how living systems manage homeostasis.

Which of the following processes is primarily responsible for the movement of water across cell membranes?