The natural nail is part of what system?

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

Answer: (B)

Natural nails are part of the integumentary system, the body's outer covering that includes skin, hair, and nails. The nail plate is made of keratin and grows from the nail matrix beneath the cuticle, serving as a protective shield for the fingertips and aiding in precise manipulation. The nervous, circulatory, and digestive systems are not where nails belong; they handle sensation, blood flow, and digestion, respectively.