The cholesterol associated with animal cell membranes helps prevent too much proximity between phospholipids.
Cholesterol, which serves as one of the fundamental components of plasma membranes, is crucial for preserving the structural stability and controlling the fluidity of cell membranes, both of which affect the homeodynamics of different membrane proteins on the cell surface.
Cholesterol's primary role is to preserve the fluidity and structural integrity of cell membranes as well as to act as a precursor for the manufacture of essential compounds for the organism, such as steroid hormones, bile acids, and vitamin D. It serves as a fluid insulator. By preventing the membrane from being too close, it keeps it more fluid even in extremely cold temperatures. It loses fluidity when the temperature is too high.
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