Low blood levels of thyroid hormone trigger a cascade of signals that moves in what order?
A)hypothalamus to anterior pituitary to thyroid gland
B)hypothalamus to posterior pituitary to thyroid gland
C)hypothalamus to parathyroid to thyroid gland
D)anterior pituitary to parathyroid to thyroid gland
E)hypothalamus to anterior pituitary to parathyroid gland

Question

Quizplus · Accepted Answer

The hypothalamus produces thyrotropin-releasing hormone (TRH), which stimulates the anterior pituitary gland to release thyroid-stimulating hormone (TSH). TSH, in turn, stimulates the thyroid gland to produce and release thyroid hormones. Therefore, low levels of thyroid hormones would trigger the hypothalamus to release TRH, which would stimulate the anterior pituitary gland to release TSH, which would then stimulate the thyroid gland to produce and release thyroid hormones.

Low Blood Levels of Thyroid Hormone Trigger a Cascade of Signals