( ( In ( most cases ) ) ( , ( ( these diseases ) ( ( are ( ( caused ( by ( ( the accumulation ) ( of plaque ) ) ) ) ( on ( ( the walls ) ( of ( ( ( ( ( arteries and ) veins ) ( -LRB- ( atherosclerosis -RRB- ) ) ) , ) ( which ( eventually ( leads ( to ( ( ( the formation ) ( of ( blood clots ) ) ) ( that ( ( block ( ( the flow ) ( of blood ) ) ) ( to ( ( ( the heart ) or ) ( the brain ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (JJS most) (NNS cases))) (, ,) (NP (DT these) (NNS diseases)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (NN accumulation)) (PP (IN of) (NP (NN plaque))))) (PP (IN on) (NP (NP (DT the) (NNS walls)) (PP (IN of) (NP (NP (NP (NNS arteries) (CC and) (NNS veins)) (PRN (-LRB- -LRB-) (NP (NNS atherosclerosis)) (-RRB- -RRB-))) (, ,) (SBAR (WHNP (WDT which)) (S (ADVP (RB eventually)) (VP (VBZ leads) (PP (TO to) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NN blood) (NNS clots))) (SBAR (WHNP (WDT that)) (S (VP (VBP block) (NP (NP (DT the) (NN flow)) (PP (IN of) (NP (NN blood)))) (PP (TO to) (NP (NP (DT the) (NN heart)) (CC or) (NP (DT the) (NN brain)))))))))))))))))) (. .)))
In most cases, these diseases are caused by the accumulation of plaque on the walls of arteries and veins (atherosclerosis), which eventually leads to the formation of blood clots that block the flow of blood to the heart or the brain.
(ROOT (S (PP (IN In) (NP (NNS atherosclerosis))) (, ,) (NP (NP (NN thickening)) (PP (IN of) (NP (NP (DT an) (JJ arterial) (NN wall)) (ADJP (JJ due) (PP (TO to) (NP (NN plaque) (NN formation))))))) (VP (MD can) (VP (VB restrict) (NP (NN blood) (NN flow)) (PP (IN through) (NP (DT the) (NN artery))))) (. .)))