The level of ionized calcium in blood falls when
A. Blood phosphate levels fall.
B. Subjects hyperventilate.
C. The thyroid gland is perfused with a calcium-rich solution.
D. Plasma protein levels fall.
E. Sodium citrate is added to the blood.
A. False It rises since the product of [Ca+] [PO4-] is constant.
B. True Alkalosis increases calcium binding by plasma proteins.
C. True Due to release of thyrocalcitonin.
D. False But the total calcium level falls.
E. True This binds calcium ions and prevents clotting
