( ( Relaxation ( of ( the ( muscle layer ) ) ) ) ( ( ( ( dilates ( the arteriole ) ) and ) ( ( increases ( the ( blood flow ) ) ) ( into ( the ( capillary bed ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Relaxation)) (PP (IN of) (NP (DT the) (NN muscle) (NN layer)))) (VP (VP (VBZ dilates) (NP (DT the) (NN arteriole))) (CC and) (VP (VBZ increases) (NP (DT the) (NN blood) (NN flow)) (PP (IN into) (NP (DT the) (JJ capillary) (NN bed))))) (. .)))
Relaxation of the muscle layer dilates the arteriole and increases the blood flow into the capillary bed.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (JJ smooth) (NN muscle)) (VP (VBZ relaxes)))) (, ,) (NP (DT the) (NNS arterioles)) (VP (VBD dilate) (, ,) (S (VP (VBG allowing) (NP (NN blood)) (S (VP (TO to) (VP (VB enter) (NP (DT the) (NNS capillaries)))))))) (. .)))