Which of the Following Is Not True Concerning the Control

Multiple Choice

Which of the following is not true concerning the control of calcium metabolism?

A) PTH (parathyroid hormone) causes an increase in plasma calcium by activation of osteoclasts.
B) PTH increases renal reabsorption of calcium.
C) vitamin D causes an increase in secretion of Ca²⁺ into the lumen of the digestive tract.
D) calcitonin causes a decrease in plasma calcium by decreasing Ca²⁺ movement from the bone fluid into the plasma and by suppressing bone resorption.
E) when plasma calcium increases, PTH decreases and calcitonin increases.