___ protrudes into the hair bulb and provides nutrients for the growing hair. A:Hair papilla B:Hair follicle C:Hair root D:Arrector pili muscle 答案: Hair papilla

___ protrudes into the hair bulb and provides nutrients for the growing hair.

A:Hair papilla
B:Hair follicle
C:Hair root
D:Arrector pili muscle
答案: Hair papilla

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___ protrudes into the hair bulb and provides nutrients for the growing hair. A:Hair papilla B:Hair follicle C:Hair root D:Arrector pili muscle 答案: Hair papilla

___ protrudes into the hair bulb and provides nutrients for the growing hair.

A:Hair papilla
B:Hair follicle
C:Hair root
D:Arrector pili muscle
答案: Hair papilla