Final answer:
Homeostasis maintains stable internal conditions in cells and the body, with membrane potential playing a key role in cell function. The fluid plasma membrane and selective permeability are crucial in homeostatic regulation and control of the cell's internal environment.
Step-by-step explanation:
The importance of homeostasis lies in its role in maintaining a stable internal environment within the cells and the body, despite changes in external conditions. The fluid nature of the plasma membrane facilitates the movement of proteins and molecules to where they are needed, ensuring homeostatic regulation. Membrane potential is critical for cell function; the resting membrane potential ensures that the cell is not in a static state but maintains a dynamic equilibrium essential for the generation of electrical signals and cellular communication. The cell membrane's selective permeability is fundamental in controlling the flow of molecules, thus contributing to maintaining homeostasis.