Which statement is a function of the integumentary system?

• A. Protects against environmental hazards
• B. Regulates heart rate
• C. Produces insulin
• D. Pumps blood

Answer: (A)

Protecting the body from environmental hazards is a major role of the integumentary system. The skin acts as a physical barrier that blocks microbes and chemicals, helps prevent water loss, and shields internal tissues from UV radiation through pigment like melanin. It also contributes to protection with its hair and nails, and supports chemical and immune defenses through glands and specialized cells. While other body systems handle heart rate, insulin production, and pumping blood, those functions belong to the cardiovascular and endocrine systems, not the skin.