Endorphins were flowing.
( Endorphins ( ( were flowing ) . ) )
(ROOT (S (NP (NNS Endorphins)) (VP (VBD were) (VP (VBG flowing))) (. .)))
I was very scared and my endorphins were flowing.
( ( ( ( I ( was ( very scared ) ) ) and ) ( ( my endorphins ) ( were flowing ) ) ) . )
(ROOT (S (S (NP (PRP I)) (VP (VBD was) (ADJP (RB very) (VBN scared)))) (CC and) (S (NP (PRP$ my) (NNS endorphins)) (VP (VBD were) (VP (VBG flowing)))) (. .)))