( ( Skeletal ( and ( cardiac muscles ) ) ) ( ( are ( ( called ( ( striated muscle ) ( because ( of ( their ( striped appearance ) ) ) ) ) ) ( under ( ( ( a microscope ) , ) ( which ( is ( due ( to ( ( the ( ( highly organized ) ( alternating pattern ) ) ) ( of ( A ( band ( and ( I band ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Skeletal) (CC and) (JJ cardiac) (NNS muscles)) (VP (VBP are) (VP (VBN called) (NP (NP (JJ striated) (NN muscle)) (PP (RB because) (IN of) (NP (PRP$ their) (JJ striped) (NN appearance)))) (PP (IN under) (NP (NP (DT a) (NN microscope)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (ADJP (RB highly) (VBN organized)) (JJ alternating) (NN pattern)) (PP (IN of) (NP (DT A) (NN band) (CC and) (NN I) (NN band))))))))))))) (. .)))
Skeletal and cardiac muscles are called striated muscle because of their striped appearance under a microscope, which is due to the highly organized alternating pattern of A band and I band.
(ROOT (S (PP (IN Like) (NP (JJ skeletal) (NN muscle))) (, ,) (NP (JJ cardiac) (NN muscle)) (VP (VBZ is) (VP (VBN striated))) (. .)))