OSMT (Ontario Society of Medical Technologists) Practice Exam

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What are hairs composed of?

Living tissue
Layers of endothelial cells
Keratinized cells
Grown from the subcutaneous layer

The correct answer is: Keratinized cells

Hairs are composed of keratinized cells. Keratin is a tough protein that is a major component of hair, nails, and the outer layer of the skin. These keratinized cells form the structure of the hair shaft, providing strength and protection. Option A is incorrect because hair is not composed of living tissue, as hair is made up of dead keratinized cells. Option B is incorrect as endothelial cells are not typically found in hairs. Option D is incorrect because hairs do not grow directly from the subcutaneous layer; rather, they grow from hair follicles located within the skin.