Indiana State Beauty Practice Exam

What is the main component in hair that gives it strength?

1. Collagen

2. Keratin

3. Elastin

4. Cholesterol

The correct answer is: Keratin

The main component in hair that provides strength is keratin. Keratin is a fibrous structural protein that forms the basis of hair, skin, and nails. This protein is highly durable and contributes to the protective qualities of hair as well as its rigidity and resistance to damage. Keratin is produced by specialized cells in the hair follicle, and its composition includes a mix of amino acids, which contribute to the overall strength and structure of hair strands. This is why hair can withstand various physical and chemical stresses, making keratin the fundamental component for maintaining the integrity and strength of hair. Other options like collagen, elastin, and cholesterol do play roles in the body, but they are not the primary components in hair. Collagen primarily provides structure to skin and connective tissues, elastin grants elasticity to these tissues, and cholesterol is significant in cellular structure and metabolism but does not directly contribute to hair strength.