Depending on how it is defined, chronic kidney disease may affect up to 10% of the world's population. The impacts on calcium homeostasis include reduced ability to conserver/reabsorb calcium, and reduced ability to convert vitamin d to calcitriol. from this, predict the likely direction of change in some factors simulated in the model. Select all that apply.
A. Increased serum calcium levels
B. Decreased serum calcium levels
C. Increased parathyroid hormone (PTH) levels
D. Decreased parathyroid hormone (PTH) levels
