What role does cholesterol play in plasma membranes?

Cholesterol is found in every cell of your body. It is especially abundant in the membranes of these cells, where it helps maintain the integrity of these membranes, and plays a role in facilitating cell signaling– meaning the ability of your cells to communicate with each other so you function as a human, rather than a pile of cells.

Without cholesterol, cell membranes would be too fluid, not firm enough, and too permeable to some molecules. In other words, it keeps the membrane from turning to mush.

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