( ( ( ( ( Remember ( that ( ( the lungs ) ( ( transfer oxygen ) ( to ( the bloodstream ) ) ) ) ) ) , ) and ) ( ( most ( of ( ( the ( actual exchange ) ) ( of ( carbon ( ( dioxide and ) oxygen ) ) ) ) ) ) ( takes ( place ( in ( the ( lower lungs ) ) ) ) ) ) ) . )
(ROOT (S (S (VP (VB Remember) (SBAR (IN that) (S (NP (DT the) (NNS lungs)) (VP (VB transfer) (NP (NN oxygen)) (PP (TO to) (NP (DT the) (NN bloodstream)))))))) (, ,) (CC and) (S (NP (NP (JJS most)) (PP (IN of) (NP (NP (DT the) (JJ actual) (NN exchange)) (PP (IN of) (NP (NN carbon) (NN dioxide) (CC and) (NN oxygen)))))) (VP (VBZ takes) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (JJR lower) (NNS lungs)))))) (. .)))
Remember that the lungs transfer oxygen to the bloodstream, and most of the actual exchange of carbon dioxide and oxygen takes place in the lower lungs.
(ROOT (S (ADVP (RB Diaphragm)) (, ,) (NP (NP (NNS lungs)) (, ,) (CC and) (NP (NN trachea))) (VP (VP (VB take) (NP (NN air)) (ADVP (RB deep)) (PP (IN into) (NP (DT the) (NN body)))) (CC and) (VP (VB provide) (NP (NN oxygen) (NN gas)) (PP (TO to) (NP (DT the) (NN bloodstream))))) (. .)))