Question

what are hair filaments primarily made of? dead keratinocytes living keratinocytes collagen fibers elastic fibers

Explanation:

Hair filaments are mainly composed of dead keratinocytes. Keratinocytes produce keratin, a protein that gives hair its structure. As hair grows, the cells at the root divide and push older cells upward. These older cells die and fill with keratin, forming the hair filament. Collagen fibers and elastic fibers are more associated with the dermis (the layer of skin beneath the epidermis where hair follicles are located) rather than the hair filament itself. Living keratinocytes are found in the hair bulb (the actively growing part of the hair follicle) but do not make up the hair filament.

Answer:

Dead keratinocytes