Parathyroid hormone (PTH) is secreted by the parathyroid glands in response to low blood concentration of calcium ions. This mechanism operates by a ________.
A) hormonal stimulus
B) humoral stimulus
C) neural stimulus
D) messenger stimulus
E) steroid stimulus

Question

Quizplus · Accepted Answer

PTH secretion is triggered by a humoral stimulus. The levels of calcium ions in the blood act as a humoral factor, which in turn triggers the secretion of PTH by the parathyroid glands.

Parathyroid Hormone (PTH) Is Secreted by the Parathyroid Glands in Response