( ( The ( external ( intercostal muscles ) ) ) ( ( ( ( elevate ( the ( rib cage ) ) ) and ) ( move ( ( the ( sternum ( anteriorly Explain ) ) ) ( what ( happens ( in ( quiet expiration ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ external) (JJ intercostal) (NNS muscles)) (VP (VP (VB elevate) (NP (DT the) (NN rib) (NN cage))) (CC and) (VP (VB move) (NP (NP (DT the) (NN sternum) (NN anteriorly) (NN Explain)) (SBAR (WHNP (WP what)) (S (VP (VBZ happens) (PP (IN in) (NP (JJ quiet) (NN expiration))))))))) (. .)))
The external intercostal muscles elevate the rib cage and move the sternum anteriorly Explain what happens in quiet expiration.
(ROOT (S (NP (DT The) (NN sternum)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (JJ elongated) (NN bony) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ anchors) (NP (DT the) (JJ anterior) (JJ thoracic) (NN cage))))))))) (. .)))