Application: The need for homeostasis applies to even one of the smallest living units, cells. The cell membrane controls what goes in and out of the cell. How could the cell membrane then be important for homeostasis?

The cell membrane plays a crucial role in maintaining homeostasis within the cell. It acts as a selective barrier, controlling the movement of substances in and out of the cell. This selective permeability ensures that essential nutrients and ions enter the cell while waste products are expelled, thus maintaining a stable internal environment. Additionally, the cell membrane regulates the concentration of various substances, such as electrolytes and proteins, which is essential for proper cellular function. By controlling the internal conditions of the cell, the cell membrane helps maintain homeostasis, ensuring that the cell operates efficiently and effectively.