What is the role of keratin in the skin?

Keratin plays a crucial role in the skin primarily by providing strength and waterproofing to the epidermis. This fibrous protein is a key component of the outer layer of the skin, known as the stratum corneum, which consists of dead skin cells filled with keratin. The presence of keratin helps to form a protective barrier that prevents excessive water loss from the body and protects against environmental damage, such as pathogens and physical abrasions.

The waterproofing property of keratin is vital because it helps maintain hydration levels within the body, preventing dehydration in various conditions. Additionally, the structural strength that keratin provides contributes to the overall integrity of the skin, allowing it to withstand stretching and other mechanical stresses. This is particularly important in areas of the body that experience frequent movement.

In contrast, the other options pertain to functions not directly associated with keratin. While some sensory functions do occur in the skin, they are primarily related to specialized nerve endings and not directly related to keratin. Thermoregulation involves sweat glands and blood vessels in the dermis rather than keratin. Nutrient absorption is not a primary function of the skin; rather, it acts as a barrier that limits absorption of substances, underscoring the protective role of