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# Cell Membrane Composition The document describes the composition of a cell membrane. It highlights the major components and their functions. ## Components The cell membrane is primarily composed of: * **Phospholipids (40%):** The document lists several types, including phosphatidylcholine, p...

# Cell Membrane Composition The document describes the composition of a cell membrane. It highlights the major components and their functions. ## Components The cell membrane is primarily composed of: * **Phospholipids (40%):** The document lists several types, including phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin. These form a double layer (bilayer) structure, with a hydrophilic (water-loving) head and hydrophobic (water-fearing) tails. This structure is crucial for maintaining the integrity of the cell membrane. * **Proteins (50%):** Proteins are also embedded within the phospholipid bilayer and play vital roles in cell function. The document distinguishes integral proteins (which span the entire bilayer) from other protein types. * **Cholesterol:** The document mentions cholesterol as a component that plays a role in regulating membrane fluidity. ## Functions of Phospholipids The document notes that phospholipids are essential for membrane structure and fluidity. They enable the passage of specific molecules across the membrane. ## Additional Notes The document also touches on how the percentage of proteins and lipids in the membrane contributes to its overall composition and function.