( ( ( ( Capillaries ( OH-130 ( and ( 20.3 A ) ) ) ) , ) ( ( B Flow ) ( of ( blood ( through ( the capillaries ) ) ) ) ) ) ( ( is ( regulated ( by ( vessels ( with ( ( smooth muscles ) ( in ( their walls ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Capillaries) (NNP OH-130) (CC and) (NNP 20.3) (NNP A)) (, ,) (NP (NP (NNP B) (NNP Flow)) (PP (IN of) (NP (NP (NN blood)) (PP (IN through) (NP (DT the) (NNS capillaries))))))) (VP (VBZ is) (VP (VBN regulated) (PP (IN by) (NP (NP (NNS vessels)) (PP (IN with) (NP (NP (JJ smooth) (NNS muscles)) (PP (IN in) (NP (PRP$ their) (NNS walls))))))))) (. .)))
Capillaries OH-130 and 20.3 A,B Flow of blood through the capillaries is regulated by vessels with smooth muscles in their walls.
(ROOT (S (NP (JJ Smooth) (NN muscle)) (VP (VBZ regulates) (NP (NP (NN air) (NN flow)) (PP (IN in) (NP (NNS lungs))))) (. .)))
Smooth muscle regulates air flow in lungs.