a) approximately 60% of filtered calcium is reabsorbed by the kidney
b) absorption of calcium in the gastrointestinal tract is mainly by passive
diffusion
c) the extent of Ca++ binding by plasma proteins is inversely proportionate to
the plasma protein level
d) levels of 1,25dihydroxycholecalciferol fall in the presence of increased
plasma Ca++

e) the majority of calcium present in bone is readily exchangeable