( ( ( increase or ) ( decrease ( in ( blood pressure ) ) ) ) ; )
(ROOT (S (VP (VP (VB increase)) (CC or) (VP (VB decrease) (PP (IN in) (NP (NN blood) (NN pressure))))) (: ;)))
increase or decrease in blood pressure;
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN gas) (NNS particles)) (VP (VB heat) (PRT (RP up))))) (, ,) (NP (NN pressure)) (VP (VBP increase)) (. .)))