While studying the skin in a science class, a student asks why all people have a pinkish color to their lips/mucous membranes. The instructor would respond by citing which of the following responses?
A)
Melanocytes are the pigment-synthesizing cells.
B)
Pheomelanin is the yellow to red pigment particularly concentrated in the lips and nipples of humans.
C)
Tyrosinase is responsible for all-colored cell production.
D)
A person with tiny melanocytes will have more concentrated pigment resulting in darker color.
Ans:
B
Feedback:
Pheomelanin, the yellow to red pigment, is found in all humans. It is particularly concentrated in the lips, nipples, glans penis, and vagina. Melanocytes are pigment-synthesizing cells that are scattered in the basal layer and are responsible for skin color (not mucous membranes). Tyrosinase converts the amino acid tyrosine to a precursor of melanin. If one has a lack of tyrosinase, the end result will be albinism. In dark-skinned people, larger melanin-containing melanosomes are produced and transferred individually to the keratinocyte.
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