( Semen ( ( ( ( ( ( ( ( consists ( of ( ( a mixture ) ( of sperm ) ) ) ) ( from ( the testicles ) ) ) and ) ( ( primarily fluid ) ( from ( the ( seminal ( vesicles ( and ( prostate gland ) ) ) ) ) ) ) ) , ) but ) ( also ( contains ( ( smaller amounts ) ( of ( ( other fluids ) ( secreted ( from ( glands ( along ( the urethra ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Semen)) (VP (VP (VP (VBZ consists) (PP (IN of) (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (NN sperm))))) (PP (IN from) (NP (DT the) (NNS testicles)))) (CC and) (VP (ADJP (RB primarily) (JJ fluid)) (PP (IN from) (NP (DT the) (NN seminal) (NNS vesicles) (CC and) (NN prostate) (NN gland))))) (, ,) (CC but) (VP (ADVP (RB also)) (VBZ contains) (NP (NP (JJR smaller) (NNS amounts)) (PP (IN of) (NP (NP (JJ other) (NNS fluids)) (VP (VBN secreted) (PP (IN from) (NP (NP (NNS glands)) (PP (IN along) (NP (DT the) (NN urethra))))))))))) (. .)))
Semen consists of a mixture of sperm from the testicles and primarily fluid from the seminal vesicles and prostate gland, but also contains smaller amounts of other fluids secreted from glands along the urethra.
(ROOT (S (NP (DT The) (NN prostate) (NN gland)) (VP (VBZ secretes) (NP (NP (DT a) (NN fluid)) (SBAR (WHNP (WDT that)) (S (VP (VBZ mixes) (PP (IN with) (NP (NN sperm))) (S (VP (TO to) (VP (VB help) (NP (NN form) (NN semen)))))))))) (. .)))