Blue tympanic membrane and cholesterol granuloma

Cholesterol is a type of lipid. Its important physiological functions in the human body include: 1. It is a component of the cell membrane. Cells absorb nutrients and discharge metabolic waste are controlled by the cell membrane. 2. It is a raw material for the synthesis of bile acids and vitamin D3. It can prevent rickets in children. 3. It is the raw material for the synthesis of steroid hormones, especially sex hormones and adrenocortical hormones. These hormones are indispensable for human health and human reproduction.

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