What is considered the head of a cholesterol molecule?

The head of a cholesterol molecule is the hydroxyl (-OH) group, which is a small polar functional group. This hydroxyl group is attached to the steroid nucleus and gives cholesterol its amphipathic nature, allowing it to interact with both hydrophilic and hydrophobic environments in cell membranes. The rest of the cholesterol molecule consists of a hydrophobic hydrocarbon tail, which helps it integrate into lipid bilayers.