( ( The ( human heart ) ) ( ( has ( ( ( two ( atria ( -LRB- ( ( ( ( a right ) and ) ( a ( left atrium ) ) ) -RRB- ) ) ) ) and ) ( ( two ventricles ) ( -LRB- ( ( ( ( a right ) and ) ( a ( left ventricle ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ human) (NN heart)) (VP (VBZ has) (NP (NP (CD two) (NN atria) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN right)) (CC and) (NP (DT a) (JJ left) (NN atrium))) (-RRB- -RRB-))) (CC and) (NP (NP (CD two) (NNS ventricles)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN right)) (CC and) (NP (DT a) (JJ left) (NN ventricle))) (-RRB- -RRB-))))) (. .)))
The human heart has two atria (a right and a left atrium) and two ventricles (a right and a left ventricle).
(ROOT (S (NP (NP (DT The) (JJ right) (NN atrium)) (PP (IN of) (NP (DT the) (JJ human) (NN heart)))) (VP (VBD pumps) (NP (DT the) (NN blood)) (PP (TO to) (NP (DT the) (JJ right) (NN ventricle)))) (. .)))