Which of the Following Is Not True Concerning the Control

question 143

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.

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