Each of the following is a function of the integumentary system except:
a. synthesis of vitamin c.
b. maintenance of body temperature.
c. detection of sensations.
d. protection of underlying tissue.
e. excretion of salts and wastes.

A. synthesis of vitamin C.

Explanation:

Integumentary system refers to the skin and its appendages. So it doesn't have the role to synthesis vitamin C, but it can synthesis  vitamin D through exposure to UV light. The major role of integumentary system is protective role (immuno defense-from infections, dehydration, temperature changes, protection of underlying tissue etc). It also contains many receptors (for pain, touch, temperature change) that detect environmental changes.

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