Which body system includes the skin and its appendages?

• A. Circulatory system
• B. Nervous system
• C. Integumentary system
• D. Respiratory system

Answer: (C)

Skin and its appendages belong to the integumentary system. This system includes the skin itself and its accessory structures like hair, nails, sweat glands, and oil glands. It serves as the body's outer covering, providing protection, helping regulate temperature, and enabling sensory perception. The circulatory system moves blood, the nervous system coordinates actions and responses, and the respiratory system handles breathing, none of which comprise the skin and its appendages. So the integumentary system is the correct choice.