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3 / 13  In humans, exposure of the skin to sunlight is required for ________.
A  vitamin D synthesis
B  arteriole constriction
C  folate production
D  thermoregulation

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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