AP BIOLOGY

Detailed explanation-1: -Cell membranes enable organisms to maintain homeostasis by regulating the materials that may enter or leave a cell. Some materials easily cross the cell membrane without the input of energy; other materials require energy input in order to cross through the cell membrane.

Detailed explanation-2: -The cell membrane maintains homeostasis in three main ways: Allowing for fluid movement of the membrane. Regulating osmosis, or the movement of water from high concentration to low concentration. Maintaining specific concentrations of ions.

Detailed explanation-3: -The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.

Detailed explanation-4: -Many substances that the cell needs cannot pass through the lipid bilayer. Transport proteins aid the movement of these substances into and out of the cell. One way that a cell maintains homeostasis is by controlling the movement of substances across the cell membrane.