Source:http://linkedlifedata.com/resource/umls/id/C0005529
MSH: The movement of materials across cell membranes and epithelial layers against an electrochemical gradient, requiring the expenditure of metabolic energy.,CSP: any ATP-driven cellular process for moving solutes or organelles; e.g., ATPase transmembrane pumps, pinocytosis and related membrane flux events, cytoskeletal rearrangements; contrast with PASSIVE TRANSPORT.