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A small involuntary muscle attached to the inner side of a follicle is known as what?

  1. Arrector pili muscle

  2. Blow dryer

  3. Cuticle layer

  4. Sweat glands

The correct answer is: Arrector pili muscle

The correct answer is "Arrector pili muscle." This is because the arrector pili muscle is a small muscle found attached to the hair follicle, responsible for causing the hair to stand up on end. This is a reflex action that helps to conserve heat and protect against cold. The other options (B, C, and D) are incorrect because they do not describe a muscle attached to a follicle. Option B, "Blow dryer," is a tool used to dry hair and is not a muscle. Option C, "Cuticle layer," is a layer of cells that protect the hair shaft, and option D, "Sweat glands," are structures responsible for producing sweat, but they are not attached to hair follicles. Therefore, A is the only correct answer.