Which one of the following groups of structures is involved in regulating calcium levels?

A. Parathyroid, thymus, intestines, kidneys, and bones.
B. Parathyroid, bones, intestines, kidnesy, and adrenal glands.
C. Thyroid, parathyroid, bones, intestines, and adrenal glands.
D. Thyroid, Parathyroid, bones, intestines, and kidneys.
Any serious help please? I'm thinking D, but am not sure.thanks in advance

3 answers

The problem I have in D is it does not include the endocrine gland skin, where Vitamin D (as a hormone) is synthesized, and it has a great role in regulating calcium levels.
ok, any other suggestions
Other than that, D is a sensible response.
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