Question

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

Explanation:

Hair filaments are primarily composed of dead keratinocytes. Keratinocytes produce the protein keratin, which is the main structural component of hair. As hair grows, the cells at the base of the hair follicle divide and push older cells upward. These older cells die and become filled with keratin, forming the hair filament. Elastic fibers are found in connective tissues like skin and blood vessels, providing elasticity. Living keratinocytes are in the basal layer of the epidermis and hair follicle bulge, actively dividing and producing keratin but are not the main component of the hair filament itself. Collagen fibers are the main structural proteins in connective tissues like tendons and skin, providing strength and structure but not the primary component of hair.

Answer:

Dead keratinocytes