Which organ system includes the skin, and what is its role in protection and thermoregulation?

Which organ system includes the skin, and what is its role in protection and thermoregulation?

• A. The nervous system; it controls reflex responses
• B. The circulatory system; it transports heat
• C. The endocrine system; it secretes hormones to control temperature
• D. The integumentary system; protects, regulates temperature, and prevents water loss

Answer: (D)