Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The HPT axis. A negative feedback loop of the hypothalamus-pituitary-thyroid (HPT) axis is shown in this picture. The thyroid stimulating hormone (TSH) stimulates the thyroid gland to produce and secrete the hormones, triiodothyrnoine (T3) and thyroxine (T4), which in turn inhibits the production of TSH. A minus sign indicates the negative feedback
