<prompt> Which of the following is the best-known metabolic function of the lungInactivation of serotoninConversion of angiotensinI to angiotensinIIInactivation of bradykininMetabolism of basic drugs by cytochrome P450 system  <response>: Extracellular ACE on the surface endothelial cells in pulmonary circulation activates Angiotensin I to Angiotensin II. 