Keratin, a tough structural protein, is the primary component of which parts of the human body?

Explanation

Keratin is a tough, fibrous structural protein that serves as the primary building block of hair, nails, and the outer protective layer of skin, contributing significantly to the durability and protective function of each of these body structures. This same versatile protein is also found forming structures like claws, horns, and feathers in various other animal species, highlighting its broadly important structural role throughout much of the animal kingdom. The specific arrangement and density of keratin fibers helps determine characteristics like the relative hardness of a fingernail compared to the greater flexibility of a strand of hair. Explore more Everyday Science MCQs on mcqstutor to keep practicing.