Parathyroid Hormone (PTH)

Parathyroid hormone (PTH)

A) is secreted in response to above normal Ca²⁺ levels in the plasma
B) is secreted in response to below normal phosphate levels in the plasma
C) acts on the liver to promote hydroxylation of vitamin D
D) acts to raise plasma Ca²⁺ to normal by stimulating Ca²⁺ reabsorption from the kidney tubule
E) acts to lower plasma Ca²⁺ and phosphate by stimulating absorption from the gut