Red Seal Cosmetology Practice Exam

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What is the medulla of the hair?

  1. The outermost layer

  2. The middle layer

  3. The layer composed of round cells

  4. The layer that produces sebum

The correct answer is: The layer composed of round cells

The medulla of the hair refers to the innermost layer of the hair shaft. This layer is composed of round cells and is typically absent in fine hair or present in fragmented form in coarse hair. Option A is incorrect because the outermost layer of the hair is called the cuticle. Option B is incorrect because the middle layer of the hair is called the cortex. Option D is incorrect because the layer that produces sebum is the sebaceous gland, which is not part of the hair structure. Therefore, option C is the only correct answer.

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