Colorado Esthetician Written Practice Exam

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Prepare for the Colorado Esthetician Written Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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What is the oily substance that protects and lubricates the skin?

Lipid
Sebum
Collagen
Keratin

The correct answer is: Lipid

The correct answer is "A. Lipid" because lipids are fatty substances that help protect and lubricate the skin. Lipids form a major component of the skin's outermost layer, helping to maintain the skin's barrier function by preventing water loss and protecting against environmental damage. Sebum (Option B) is a type of oil produced by the sebaceous glands in the skin that helps to lubricate and waterproof the skin. Collagen (Option C) is a protein that helps maintain the skin's strength and elasticity, while keratin (Option D) is a tough protein that forms the structure of the skin, hair, and nails.