Hair and nails are part of which system in the body?

• A. Nervous system
• B. Integumentary system
• C. Skeletal system
• D. Muscular system

Answer: (B)

Hair and nails are integral components of the integumentary system, which is the body's largest organ system. This system primarily serves as a protective barrier, covering and protecting the internal structures of the body. It also plays roles in temperature regulation, sensation, and the synthesis of vitamin D. The integumentary system includes not only the skin but also appendages such as hair and nails, which contribute to its overall function.

By being part of the integumentary system, hair helps in regulating body temperature and provides protection from environmental elements, while nails serve protective functions for the tips of fingers and toes and aid in fine motor skills. Understanding this connection is essential for comprehensive knowledge in fields related to health and beauty, especially in nail technology and cosmetology, where the care and maintenance of nails are crucial.