What Two Hormones are Involved in Regulating the Blood Calcium

Question

What two hormones are involved in regulating the blood calcium level?
A) calcitonin and renin
B) renin and aldosterone
C) renin and PTH
D) aldosterone and PTH
E) PTH and calcitonin

Accepted Answer

Parathyroid hormone (PTH) and calcitonin are the two hormones involved in regulating the blood calcium level. PTH increases blood calcium levels by stimulating the release of calcium from bones and by increasing the absorption of calcium in the kidneys and intestines. Calcitonin, on the other hand, decreases blood calcium levels by inhibiting calcium release from bones and increasing calcium excretion in the kidneys.