Final answer:
The hair shaft, keratin, and hair root are key aspects of understanding the structure of hair.
Explanation:
The hair shaft is the part of the hair that is visible above the skin's surface and consists of dead keratinocytes. It is primarily made of the tough protein keratin. The rest of the hair, which is anchored in the follicle, lies below the surface of the skin and is referred to as the hair root.
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