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Hair scalp science practice questions

25 questions from the cosmetology theory practice test.

Hair scalp science practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

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Sample questions

Which layer of the hair gives it most of its strength, elasticity and natural color?

  1. Cuticle
  2. Dermal papilla
  3. Medulla
  4. Cortex
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D. Cortex

The cortex is the fibrous middle layer; it holds the melanin and accounts for most of the hair's weight, strength and elasticity. The cuticle protects the cortex but contributes little strength and holds no pigment.

Reference: Hair science: layers of the hair shaft

Which layer of the hair shaft may be missing entirely in very fine hair?

  1. Bulb
  2. Medulla
  3. Cuticle
  4. Cortex
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B. Medulla

The medulla is the innermost core of the shaft and is often absent in very fine or naturally blond hair; it plays no part in salon services. Every hair has a cuticle and a cortex.

Reference: Hair science: layers of the hair shaft

Which structure at the base of the follicle supplies the blood and nutrients needed for hair growth?

  1. Sebaceous gland
  2. Arrector pili muscle
  3. Dermal papilla
  4. Hair cuticle
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C. Dermal papilla

The dermal papilla is the small cone of tissue that fits into the hair bulb and carries the blood and nerve supply that feeds growth. The sebaceous gland only supplies oil to the follicle, and the arrector pili muscle makes the hair stand up.

Reference: Hair science: structures of the hair root

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