American Academy of Professional Coders (AAPC) Practice Exam

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What is a fingernail primarily made of?

Collagen
Keratin
Melanin
Protein

The correct answer is: Keratin

Fingernails are primarily made of keratin, a type of protein that is also a key structural component of skin and hair. Keratin is a fibrous protein that provides strength and resilience, making it crucial for the durability of nails. The unique composition of keratin in the layers of the nail plate allows it to protect the fingertips and enhance the sensation of touch. While it is true that keratin is a protein, the specificity of keratin as the component provides a more accurate answer in the context of fingernails compared to a general reference to protein. Collagen, on the other hand, is another type of protein found in connective tissues but is not a primary component of nails. Melanin is a pigment responsible for the color of skin and hair but does not contribute to the structural makeup of fingernails. Therefore, identifying keratin as the primary material accurately reflects the biological makeup of fingernails.