What effect does keratin have on skin?

Keratin plays a crucial role in the structure and function of the skin, particularly in enhancing its strength and water resistance. This fibrous protein is a primary component of the outer layer of the skin, known as the epidermis. Keratin contributes to the formation of a protective barrier that helps prevent water loss and shields underlying tissues from environmental damage and pathogens.

The presence of keratin in the skin means it has a significant role in making the epidermis durable and resilient, allowing it to withstand mechanical stress while also preventing excessive moisture from escaping. This is particularly important in maintaining skin hydration and overall integrity.

Other options do not capture the primary role of keratin. For example, while it is vital for skin strength, it does not directly impact elasticity or sensory functions, nor does it play a role in regulating temperature. Instead, functions related to elasticity and temperature regulation involve other factors, such as collagen fibers and sweat glands. Thus, the enhancement of strength and water resistance is indeed the defining characteristic of keratin in the context of skin function.