动袭凄枫匙态沪掇蔡垢部桔猾
Special cells， ____， in the epidermis produce the black pigment that gives color to the skin and protects against damage from the ultraviolet rays of the sun.
A:melanocytes
B:erythrocytes
C:leukocytes
D:phagocytes
答案: melanocytes
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相关试题
Adipose tissue mainly exists in ______.
A:epidermis
B: dermis
C:subcutaneous layer
D:corium
答案: subcutaneous layer
Which of the following is not the accessory structure of the skin?
A:hair
B: nail
C:sweat gland
D:sebum
答案: sebum
___ 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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