Final answer:
Cholesterol is vital for cell structure, hormone production, and important biological processes, but excess levels can be detrimental to health.
Explanation:
Cholesterol plays a crucial role in the human body by serving as a structural component of cell membranes and as a precursor for essential substances like vitamin D, bile, and sex hormones. It is also involved in cell signaling, transport processes, nerve conduction, and gene transcription. However, excessive cholesterol can lead to various diseases, including cardiovascular issues.
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