( ( How ( ( the Thyroid ) ( Functions ( The ( thyroid gland ) ) ) ) ) ( ( operates ( as ( part ( of ( ( a ( feedback mechanism ) ) ( involving ( ( ( the hypothalamus ) and ) ( the ( pituitary gland ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (SBAR (WHADVP (WRB How)) (S (NP (DT the) (NNP Thyroid)) (VP (VBZ Functions) (NP (DT The) (NN thyroid) (NN gland))))) (VP (VBZ operates) (PP (IN as) (NP (NP (NN part)) (PP (IN of) (NP (NP (DT a) (NN feedback) (NN mechanism)) (PP (VBG involving) (NP (NP (DT the) (NNS hypothalamus)) (CC and) (NP (DT the) (JJ pituitary) (NN gland))))))))) (. .)))
How the Thyroid Functions The thyroid gland operates as part of a feedback mechanism involving the hypothalamus and the pituitary gland.
(ROOT (S (NP (DT The) (NN thyroid) (NN gland)) (VP (VBZ is) (VP (VBN controlled) (PP (IN by) (NP (NP (DT a) (JJ negative) (NN feedback) (NN loop)) (SBAR (WHNP (WDT that)) (S (VP (VBZ includes) (NP (DT the) (ADJP (JJ hypothalamus) (CC and) (JJ pituitary)) (NN gland))))))))) (. .)))
The thyroid gland is controlled by a negative feedback loop that includes the hypothalamus and pituitary gland.