( when ( ( hair cells ) ( ( ( are ( bent ( against ( the ( tectorial membrane ) ) ) ) ) , ) ( causing ( them ( to ( ( ( depolarize and ) release ) ( neurotransmitter ( that ( stimulates ( sensory neurons ) ) ) ) ) ) ) ) ) ) )
(ROOT (SBAR (WHADVP (WRB when)) (S (NP (NN hair) (NNS cells)) (VP (VBP are) (ADJP (JJ bent) (PP (IN against) (NP (DT the) (JJ tectorial) (NN membrane)))) (, ,) (S (VP (VBG causing) (S (NP (PRP them)) (VP (TO to) (VP (VB depolarize) (CC and) (VB release) (NP (NP (NN neurotransmitter)) (SBAR (WHNP (WDT that)) (S (VP (VBZ stimulates) (NP (JJ sensory) (NNS neurons)))))))))))))))
when hair cells are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons
(ROOT (S (NP (NP (JJ Hair) (NNS cells)) (PP (IN in) (NP (DT the) (NN cochlea) (NN release)))) (VP (VBZ neurotransmitters) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VB bend))))) (. .)))