Parathyroid hormone has all of the following effects EXCEPT...?
ExplanationD. Parathyroid hormone (PTH) acts to increase the circulating levels of calcium. This is achieved by increasing osteoclastic activity, stimulating the kidney to re-absorb calcium and excrete phosphate. It also acts to convert 25-hydroxyvitamin D3 to the active form 1,25-di-hydroxyvitamin D3 which stimulates the absorption of calcium from the gastro-intestinal tract
