A small amount of ultraviolet radiation is beneficial because it
A) increases blood flow in the dermis.
B) stimulates the synthesis of photoreceptor pigments in the eye.
C) constricts blood vessels in the dermis.
D) stimulates vitamin D₃ synthesis in the epidermis.
E) adjusts overall gland secretion rates in the body.
Correct Answer:
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A)
A) It
A) melanin
B) keratin
C)
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