Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

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What is the main role of the arrector pili muscle?

Facilitates hair growth
Regulates sebum production
Contracts to create goosebumps
Supports hair color determination

The correct answer is: Contracts to create goosebumps

The main role of the arrector pili muscle is to contract and create goosebumps. This small muscle is attached to hair follicles and, when stimulated, it pulls the hair upright. This action leads to the formation of bumps on the skin's surface known as goosebumps. This phenomenon can occur in response to cold temperatures or emotional responses, such as fear or excitement, as a part of the body’s natural reflexes. While the other choices may touch on aspects of hair and skin physiology, they do not accurately describe the primary function of the arrector pili muscle. Facilitating hair growth pertains to different biological processes, regulating sebum production is managed by sebaceous glands, and hair color determination is influenced by genetics and melanin rather than a direct action of the arrector pili muscle. Thus, the contraction of this muscle to create goosebumps is the most relevant and precise function in this context.