Q. Regarding calcium metabolism: (Solved)
1. approximately 60% of filtered calcium is reabsorbed by the kidney
2. absorption of calcium in the gastrointestinal tract is mainly by passive diffusion
3. the extent of Ca++ binding by plasma proteins is inversely proportionate to the plasma protein level
4. levels of 1,25-dihydroxycholecalciferol fall in the presence of increased plasma Ca++
5. the majority of calcium present in bone is readily exchangeable
- d. levels of 1,25-dihydroxycholecalciferol fall in the presence of increased plasma Ca++