By the time the hair shaft emerges from the scalp, its cells are keratinized and are

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Multiple Choice

By the time the hair shaft emerges from the scalp, its cells are keratinized and are

Explanation:
The main idea is that the hair shaft is made of keratinized, dead cells. As hair grows, cells move upward from the follicle and undergo keratinization, losing nuclei and other living organelles. By the time the shaft emerges from the scalp, those cells have been transformed into hard, keratin-filled material and are no longer living or metabolically active. The only living, actively dividing cells are in the hair bulb at the base of the follicle; once pushed above the surface, the visible shaft remains as dead, keratinized tissue. So the statement that the cells are no longer living best fits what the hair shaft is at emergence.

The main idea is that the hair shaft is made of keratinized, dead cells. As hair grows, cells move upward from the follicle and undergo keratinization, losing nuclei and other living organelles. By the time the shaft emerges from the scalp, those cells have been transformed into hard, keratin-filled material and are no longer living or metabolically active. The only living, actively dividing cells are in the hair bulb at the base of the follicle; once pushed above the surface, the visible shaft remains as dead, keratinized tissue. So the statement that the cells are no longer living best fits what the hair shaft is at emergence.

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