Which is not involved in the feedback loop regulation of thyroid hormone secretion?
A)Hypothalamus
B)Thyroid stimulating hormone
C)Thyrotropin-releasing hormone
D)Parafollicular cells
E)Thyrotropic cells

Question

Quizplus · Accepted Answer

Parafollicular cells, also known as C-cells, produce calcitonin and are not involved in the feedback loop regulation of thyroid hormone secretion. The feedback loop involves the hypothalamus releasing thyrotropin-releasing hormone (TRH), which stimulates the thyrotropic cells in the anterior pituitary to release thyroid-stimulating hormone (TSH). TSH then stimulates the thyroid gland to produce and release thyroid hormones. When thyroid hormone levels in the blood reach a certain threshold, they inhibit the release of both TRH and TSH, thus maintaining homeostasis.

Which Is Not Involved in the Feedback Loop Regulation of Thyroid