What is the primary component of nails?

The primary component of nails is keratin, which is a type of protein that is essential for the structure and strength of nails. Keratin is also found in hair and the outer layer of skin, making it a crucial protein for protecting and supporting these body parts. The specific type of keratin in nails is particularly tough and forms a hard, protective surface that shields the sensitive tissues underneath.

Other proteins such as collagen and elastin play important roles in the overall structure and flexibility of tissues but are not the main components of nails. Likewise, chitin is a structural component found in the exoskeletons of arthropods and is not relevant to human nails. Therefore, keratin stands out as the key protein that gives nails their durability and essential protective functions.