What serves as the positive stimulus in the control of thyroid hormone secretion?
A)increased metabolic rate
B)high thyroid hormone levels in blood
C)low thyroid hormone levels in blood
D)high thyroid releasing hormones in blood
E)action potential in neurosecretory cells

Question

Quizplus · Accepted Answer

In the control of thyroid hormone secretion, low levels of thyroid hormone in the blood serve as the positive stimulus. This triggers the release of thyroid-stimulating hormone (TSH) from the anterior pituitary gland, which stimulates the thyroid gland to produce and secrete more thyroid hormone.

What Serves as the Positive Stimulus in the Control of Thyroid