Hair regrowth depends on the integrity of which structure?

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Multiple Choice

Hair regrowth depends on the integrity of which structure?

Explanation:
Hair regrowth depends on the dermal papilla at the base of the follicle. This structure contains blood vessels and signaling cells that nourish the growing hair and regulate the hair cycle, guiding the follicle through the active growth phase. If the papilla is damaged or its signaling is disrupted, the follicle can’t sustain new hair formation. The cortex, cuticle, and medulla are parts of the hair shaft itself and contribute to the hair’s strength, color, and structure, but they do not regulate regrowth.

Hair regrowth depends on the dermal papilla at the base of the follicle. This structure contains blood vessels and signaling cells that nourish the growing hair and regulate the hair cycle, guiding the follicle through the active growth phase. If the papilla is damaged or its signaling is disrupted, the follicle can’t sustain new hair formation. The cortex, cuticle, and medulla are parts of the hair shaft itself and contribute to the hair’s strength, color, and structure, but they do not regulate regrowth.

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