Question

how does the integumentary system interact with the skeletal system?
the integumentary system functions in the activation of vitamin d.
the integumentary system digests food, providing the nutrients for osteoblasts.
the integumentary system absorbs calcium for the matrix of bone.
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Explanation:

The integumentary system (skin) is involved in vitamin D activation. When exposed to sunlight, a precursor molecule in the skin is converted to an active form of vitamin D. Vitamin D is essential for calcium absorption in the intestines, which is important for bone - health maintained by the skeletal system. The integumentary system does not digest food (that's the digestive system's role) or directly absorb calcium for bone matrix.

Answer:

The integumentary system functions in the activation of vitamin D.