( ( ( Smooth ( muscle sphincters ) ) ( on ( precapillary ( blood vessels ) ) ) ) ( ( act ( to ( ( maintain ( ( a ( ( homeostatically even ) flow ) ) ( of blood ) ) ) ( through ( the ( adjacent capillaries ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Smooth) (NN muscle) (NNS sphincters)) (PP (IN on) (NP (JJ precapillary) (NN blood) (NNS vessels)))) (VP (VBP act) (S (VP (TO to) (VP (VB maintain) (NP (NP (DT a) (ADJP (RB homeostatically) (RB even)) (NN flow)) (PP (IN of) (NP (NN blood)))) (PP (IN through) (NP (DT the) (JJ adjacent) (NNS capillaries))))))) (. .)))
Smooth muscle sphincters on precapillary blood vessels act to maintain a homeostatically even flow of blood through the adjacent capillaries.
(ROOT (NP (NP (NP (DT The) (ADJP (RB precapillary) (JJ sphincters)) (NN regulate)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (NP (NP (DT the) (NN passage)) (PP (IN of) (NP (NP (NN blood)) (PP (IN into) (NP (JJ capillary) (NNS beds)))))) (. .)))