题目内容

单选Which of the following means softening of nails?( )

A. onychomycosis
B. onychophagia
C. onychectomy
D. onychomalacia

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单选Collagen fibers are the major components of the ____

A. subcutaneous layer
B. dermis
C. epidermis
D. hypodermis

单选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. leukocytes
B. erythrocytes
C. phagocytes
D. melanocytes

单选Adipose tissue mainly exists in ______

A. epidermis
B. dermis
C. subcutaneous layer
D. corium

单选Which of the following is not the accessory structure of the skin? ( )

A. sebum
B. sweat gland
C. hair
D. nail