Which of the following is part of the integumentary system?

• A. Bones
• B. Lungs
• C. Skin, sweat glands, hair, and nails
• D. Kidneys

Answer: (C)

The integumentary system is the body's external protective covering and its associated structures. Skin, sweat glands, hair, and nails are all components of this system, so listing them together directly identifies the parts that make up the integumentary system. The skin acts as a barrier against environmental threats and helps regulate body temperature; sweat glands produce moisture to cool the body; hair provides insulation and sensory input; nails protect the fingertips and enhance grip. In contrast, bones belong to the skeletal system, lungs to the respiratory system, and kidneys to the urinary system. Recognizing these parts and their roles helps you understand how this system supports protection, temperature control, and sensation.