Which part of the nail is composed of hardened keratin?

The nail plate is the part of the nail that is primarily made up of hardened keratin, which is a tough, fibrous protein. This structure is visible as the hard part of the nail that covers the nail bed. The keratin in the nail plate provides strength and protection, making it essential for the overall integrity and functionality of the nail.

Unlike the nail plate, other components such as nail folds (the skin surrounding the nail), the free edge (the tip of the nail that extends beyond the nail bed), and the nail bed (the area of skin beneath the nail plate) serve different purposes and are not composed of hardened keratin. Instead, they are primarily made up of softer tissues and skin structures. Understanding the composition and purpose of each part of the nail is crucial for anyone studying nail technology or preparing for the Ohio State Board Nail Theory & Advanced Manicure Practice Exam.