Which hormone increases calcium absorption by the kidneys?
a. Antidiuretic hormone (ADH)
b. Parathyroid hormone
c. Calcitonin
d. Aldosterone
ANS: B
Parathyroid hormone increases the reabsorption of calcium and the excretion of phosphate by the kidneys and activates vitamin D. ADH increases water reabsorption, calcitonin causes calcium loss, and aldosterone causes sodium and water retention.
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