( ( These ( various ( muscle tissues ) ) ) ( ( ( are either ) ( ( ( classed ( as ( ( ( ( ( either ( smooth muscle ) ) ( -LRB- ( ( ( visceral and ) vascular ) -RRB- ) ) ) or ) ( striated muscle ) ) ( -LRB- ( ( ( skeletal and ) cardiac ) -RRB- ) ) ) ) ) , ) ( based ( on ( ( the ( microscopic appearance ) ) ( of ( their cells ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (JJ various) (NN muscle) (NNS tissues)) (VP (VBP are) (ADVP (RB either)) (VP (VBN classed) (PP (IN as) (NP (NP (DT either) (JJ smooth) (NN muscle)) (PRN (-LRB- -LRB-) (NP (JJ visceral) (CC and) (JJ vascular)) (-RRB- -RRB-)) (CC or) (NP (JJ striated) (NN muscle)) (PRN (-LRB- -LRB-) (NP (JJ skeletal) (CC and) (JJ cardiac)) (-RRB- -RRB-)))) (, ,) (PP (VBN based) (PP (IN on) (NP (NP (DT the) (JJ microscopic) (NN appearance)) (PP (IN of) (NP (PRP$ their) (NNS cells)))))))) (. .)))
These various muscle tissues are either classed as either smooth muscle (visceral and vascular) or striated muscle (skeletal and cardiac), based on the microscopic appearance of their cells.
(ROOT (S (PP (IN Like) (NP (JJ skeletal) (NN muscle))) (, ,) (NP (JJ cardiac) (NN muscle)) (VP (VBZ is) (VP (VBN striated))) (. .)))