( ( Facilitated diffusion ) ( ( is ( ( the diffusion ) ( of ( molecules ( using ( ( a ( special ( carrier protein ) ) ) ( Concentration ( is ( ( the number ) ( of ( ( molecules ( -LRB- ( or ( ions -RRB- ) ) ) ) ( of ( ( a substance ) ( in ( ( a ( given volume ) ) ( of fluid ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Facilitated) (NN diffusion)) (VP (VBZ is) (NP (NP (DT the) (NN diffusion)) (PP (IN of) (NP (NP (NNS molecules)) (VP (VBG using) (NP (NP (DT a) (JJ special) (NN carrier) (NN protein)) (SBAR (S (NP (NNP Concentration)) (VP (VBZ is) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NP (NNS molecules)) (PRN (-LRB- -LRB-) (CC or) (ADJP (JJ ions)) (-RRB- -RRB-))) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN in) (NP (NP (DT a) (VBN given) (NN volume)) (PP (IN of) (NP (NN fluid))))))))))))))))))) (. .)))
Facilitated diffusion is the diffusion of molecules using a special carrier protein Concentration is the number of molecules (or ions) of a substance in a given volume of fluid.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NP (NNS particles)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN in) (NP (DT a) (VBN given) (NN volume)))))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT the) (NN concentration))))) (. .)))