The secretion of parathyroid hormone is controlled primarily by the
A)hypothalamus.
B)concentration of blood calcium.
C)thyroid gland.
D)pituitary gland.

Question

Quizplus · Accepted Answer

Parathyroid hormone secretion is primarily controlled by the concentration of calcium in the blood. When calcium levels are low, parathyroid hormone secretion increases to increase blood calcium levels. When calcium levels are high, parathyroid hormone secretion decreases to lower blood calcium levels. The hypothalamus and pituitary gland can indirectly affect parathyroid hormone secretion through their influence on the calcium-regulating hormones calcitonin and vitamin D, but they are not the primary controllers of parathyroid hormone secretion. The thyroid gland does not play a direct role in parathyroid hormone secretion.

The Secretion of Parathyroid Hormone Is Controlled Primarily by the