AP BIOLOGY

Detailed explanation-1: -Definition. 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-2: -Cell membranes are an example of semi-permeable membranes. Cell membranes allow small molecules such as oxygen, water carbon dioxide, and oxygen to pass through but do not allow larger molecules like glucose, sucrose, proteins, and starch to enter the cell directly.

Detailed explanation-3: -As previously mentioned, phospholipids play a critical role in insulating cell membranes. Two of the most important outer and inner leaflet phospholipids are phosphatidylcholine (PC) and Phosphatidylserine (PS).

Detailed explanation-4: -The cell membrane separates the material outside the cell, extracellular, from the material inside the cell, intracellular. It maintains the integrity of a cell and controls passage of materials into and out of the cell.

Detailed explanation-5: -cell membrane, also called plasma membrane, thin membrane that surrounds every living cell, delimiting the cell from the environment around it.