What are keratinocytes?

Keratinocytes are the primary type of skin cells found in the epidermis, serving several vital functions, one of which involves the tanning process. These cells make up about 90% of the epidermis and are crucial in forming a protective barrier against environmental damage.

When exposed to ultraviolet (UV) radiation, keratinocytes produce more melanin to protect deeper skin layers from damage. This process results in what is commonly referred to as "tanning." The increase in melanin not only contributes to skin color but also serves as a natural defense mechanism against the harmful effects of UV radiation. Thus, the answer that identifies keratinocytes as the cells in the epidermis that get tanned is accurate, reflecting their role in the tanning process as a response to UV exposure.