( ( Under ( these circumstances ) ) ( , ( thermoregulation ( ( is ( ( the ability ) ( of ( the ( human ( body ( to ( maintain ( ( ( a ( regular ( body temperature ) ) ) , ) ( ( even when ) ( ( the ( surrounding temperature ) ) ( is ( immeasurably different ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Under) (NP (DT these) (NNS circumstances))) (, ,) (NP (NN thermoregulation)) (VP (VBZ is) (NP (NP (DT the) (NN ability)) (PP (IN of) (NP (DT the) (JJ human) (NN body) (S (VP (TO to) (VP (VB maintain) (NP (NP (DT a) (JJ regular) (NN body) (NN temperature)) (, ,) (SBAR (WHADVP (RB even) (WRB when)) (S (NP (DT the) (VBG surrounding) (NN temperature)) (VP (VBZ is) (ADJP (RB immeasurably) (JJ different))))))))))))) (. .)))
Under these circumstances, thermoregulation is the ability of the human body to maintain a regular body temperature, even when the surrounding temperature is immeasurably different.
(ROOT (S (NP (NNP Thermoregulation)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHNP (WHADVP (WRB when)) (NNS animals)) (S (VP (VBP maintain) (NP (DT an) (JJ internal) (NN temperature))))))) (. .)))