( ( ( One teat ) ( for ( ( each gland ) ( The ( teat ( or ( streak canal ) ) ) ) ) ) ) ( ( ( is normally ) ( closed ( by ( ( a ( smooth ( muscle sphincter ) ) ) ( that ( encircles ( the canal ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One) (NN teat)) (PP (IN for) (NP (NP (DT each) (NN gland)) (NP (DT The) (NN teat) (CC or) (NN streak) (NN canal))))) (VP (VBZ is) (ADVP (RB normally)) (VP (VBN closed) (PP (IN by) (NP (NP (DT a) (JJ smooth) (NN muscle) (NN sphincter)) (SBAR (WHNP (WDT that)) (S (VP (VBZ encircles) (NP (DT the) (NN canal))))))))) (. .)))
One teat for each gland The teat or streak canal is normally closed by a smooth muscle sphincter that encircles the canal.
(ROOT (S (S (VP (VBG Acting) (PP (IN like) (NP (NNS drawstrings))) (S (VP (TO to) (VP (VB close) (PRT (RP off)) (NP (DT the) (JJ alimentary) (NN canal))))))) (, ,) (NP (DT the) (NN sphincter)) (VP (VBZ regulates) (NP (NP (DT the) (NN passage)) (PP (IN of) (NP (NP (NN material)) (PP (IN between) (NP (NNS compartments))))))) (. .)))