Kev tsim thiab tso tawm ntawm cov thyroid hormones, thyroxine thiab triiodothyronine, yog tswj los ntawm lub voj voog tawm tswv yim nrog rau lub qog hypothalamus, pituitary caj pas thiab cov thyroid caj pas. Ua kom cov thyroid hormones yog tswj hwm hauv cov ntaub so ntswg hauv lub cev xws li daim siab, hlwb thiab ob lub raum los ntawm cov enzymes hu ua deiodinases uas hloov thyroxine rau hauv daim ntawv nquag triiodothyronine. Feem ntau ntawm lub cev circulating triiodothyronine (kwv yees li 80%) yog tsim nyob rau hauv no txoj kev.
Cov thyroid hormone ntau lawm system yog tswj los ntawm lub voj voog tawm tswv yim kom thaum qib ntawm cov thyroid hormones thyroxine thiab triiodothyronine nce, lawv tiv thaiv kev tso tawm ntawm ob qho tib si thyrotropin-tso cov tshuaj hormones los ntawm hypothalamus thiab thyroid stimulating hormone los ntawm lub caj pas pituitary. Cov txheej txheem no tso cai rau lub cev kom tswj tau cov thyroid hormones tas li hauv lub cev.
