( However ( , ( ( when ( ketones form ) ) ( , ( ( the blood ) ( ( becomes ( ( quite ( acidic ( and ( various organs ) ) ) ) ( such ( as ( ( kidney ( , ( heart ( , ( and brain ) ) ) ) ) ( are ( affected ( by ( blood acidity ) ) ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (NNS ketones)) (VP (VBP form)))) (, ,) (NP (DT the) (NN blood)) (VP (VBZ becomes) (NP (NP (RB quite) (JJ acidic) (CC and) (JJ various) (NNS organs)) (PP (JJ such) (IN as) (NP (NP (NN kidney) (, ,) (NN heart) (, ,) (CC and) (NN brain)) (SBAR (S (VP (VBP are) (VP (VBN affected) (PP (IN by) (NP (NN blood) (NN acidity))))))))))) (. .)))
However, when ketones form, the blood becomes quite acidic and various organs such as kidney, heart, and brain are affected by blood acidity.
(ROOT (S (PP (IN In) (NP (NNS humans))) (, ,) (NP (DT the) (NN heart)) (VP (VBZ is) (NP (DT the) (JJ first) (NN organ) (S (VP (TO to) (VP (VP (VB form)) (CC and) (VP (VB become) (ADJP (JJ functional)))))))) (. .)))