Final answer:
The statement that dander consists of dead keratinocytes is true, as it is part of the skin's natural renewal process where dead skin cells filled with keratin are shed.
Step-by-step explanation:
True or False: Dander consists of dead keratinocytes? The answer is true. Animal dander, much like human dandruff, includes flaked-off skin cells and is composed largely of dead keratinocytes. These keratinocytes have gone through a process called keratinization, where they get filled with keratin as they move from the deeper layers of the skin towards the surface. Eventually, these cells, which compose the hair shaft and are present in the stratum corneum of the skin, lack a nucleus and organelles, indicating that they are no longer living. This is part of the natural cycle of skin renewal, where new epidermal cells are continually formed and old ones are shed from the body, ensuring that damage to the surface layers does not result in permanent harm to the skin.