Salts and water.
D000818:Animals; D001639:Bicarbonates / Q000378:metabolism; D001692:Biological Transport; D001693:Biological Transport, Active; D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000494:pharmacology; D002712:Chlorides / Q000378:metabolism; D003106:Colon / Q000187:drug effects / Q000378:metabolism; D003967:Diarrhea / Q000378:metabolism; D005243:Feces / Q000032:analysis; D006728:Hormones / Q000494:pharmacology; D006801:Humans; D007408:Intestinal Absorption / Q000187:drug effects; D007413:Intestinal Mucosa / Q000378:metabolism; D007421:Intestine, Small / Q000187:drug effects / Q000378:metabolism; D007422:Intestines / Q000098:blood supply; D007700:Kinetics; D008433:Mathematics; D008954:Models, Biological; D009995:Osmosis; D011188:Potassium / Q000378:metabolism; D012492:Salts / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism; D014867:Water / Q000378:metabolism*
D001639:Bicarbonates; D002241:Carbohydrates; D002712:Chlorides; D006728:Hormones; D012492:Salts; D014867:Water; D012964:Sodium; D011188:Potassium