Which of the following proteins, common to the epidermis, is believed to play a significant role in forming the outer barrier of the skin?
A) Keratin cells
B) Melanocytes
C) Merkel cells
D) Langerhans' cells
Ans: A
Feedback: Dead cells of the epidermis contain keratin, an insoluble, fibrous protein that forms the outer barrier of the skin. Melanocytes are primarily involved in producing the pigment melanin. Merkel cells are the receptors that transmit stimuli to the axon through a chemical synapse. Langerhans' cells are believed to play a significant role in cutaneous immune system reactions.
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