What stimulates the release of parathyroid hormone (PTH)?
A)high levels of vitamin D
B)high levels of vitamin C
C)low blood calcium ion levels
D)high blood calcium ion levels

Question

Quizplus · Accepted Answer

Parathyroid hormone is mainly secreted in response to low blood calcium ion levels. The amount of PTH secretion increases as the blood calcium ion levels decrease. PTH acts to increase blood calcium levels by stimulating the release of calcium from bones, increasing calcium absorption in the gut, and reducing calcium excretion in the kidneys.

What Stimulates the Release of Parathyroid Hormone (PTH)