The cell membrane, also known as the plasma membrane, is a crucial component of cells. It is primarily composed of a phospholipid bilayer, which provides a semi-permeable barrier between the cell's interior and its external environment. Embedded within this bilayer are various proteins, cholesterol, and carbohydrates that contribute to the membrane's function and structural integrity. The phospholipid molecules are arranged with their hydrophilic (water-attracting) heads facing outward and their hydrophobic (water-repelling) tails facing inward, creating a hydrophobic core.
