Which body system consists of the skin, mucous membranes, hair, and nails?

Which body system consists of the skin, mucous membranes, hair, and nails?

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

Answer: (B)

The main idea is recognizing the body's outer protective covering and its related structures. The skin is the primary organ of this system, acting as a barrier to injury and infection, helping regulate body temperature, and providing sensory information. Hair and nails are keratinized extensions of the skin that offer protection and contribute to sensation. Mucous membranes line many passages that open to the outside and produce mucus to trap microbes and keep surfaces moist; in many introductory frameworks these membranes are included with the same system because they support the body's first line of defense and overall barrier function. Together, these components define the integumentary system, unlike the circulatory system (blood and vessels), the nervous system (brain and nerves), or the digestive system (stomach and intestines).

The main idea is recognizing the body's outer protective covering and its related structures. The skin is the primary organ of this system, acting as a barrier to injury and infection, helping regulate body temperature, and providing sensory information. Hair and nails are keratinized extensions of the skin that offer protection and contribute to sensation. Mucous membranes line many passages that open to the outside and produce mucus to trap microbes and keep surfaces moist; in many introductory frameworks these membranes are included with the same system because they support the body's first line of defense and overall barrier function. Together, these components define the integumentary system, unlike the circulatory system (blood and vessels), the nervous system (brain and nerves), or the digestive system (stomach and intestines).