PSI Barbering Practice Exam

What is a primary function of the skin that protects the body from environmental hazards?

1. Heat regulation

2. Fluid absorption

3. Vitamin production

4. Gas exchange

The correct answer is: Heat regulation

The primary function of the skin in protecting the body from environmental hazards is heat regulation. The skin acts as a barrier, controlling the body temperature through processes like sweating and blood vessel dilation or constriction. This ability to regulate temperature helps prevent overheating or excessive cooling, which could result in environmental hazards such as heat stress or hypothermia. The skin also provides a protective layer against harmful microorganisms, UV radiation, and physical trauma, contributing to the overall safety and health of the body. While fluid absorption, vitamin production, and gas exchange play significant roles in the body, they are not primarily focused on protecting against environmental hazards. Fluid absorption is limited in the skin and primarily relates to hydration and moisture retention. Vitamin production, such as Vitamin D synthesis from sunlight, supports various bodily functions but does not provide direct protection against environmental threats. Gas exchange, which is a critical function of respiratory organs, is not a role that skin performs effectively, further distinguishing heat regulation as the primary protective function.