Unidirectional ion movements in the hindgut of larval Sarcophaga bullata (Diptera: Sarcophagidae).
1. Unidirectional Na+, K+, and Cl- fluxes were measured across the isolated hindgut of larval Sarcophaga bullata. 2. Both K+ and Cl- are actively secreted into the hindgut lumen, whereas Na+ is distributed passively. 3. The movements of K+ and Cl- are not entirely independent of each other, and the movement of one ion influences the flux of the co-ion. 4. The NH4+ ion is secreted into the hindgut by a mechanism separate from K+ secretion.
D000641:Ammonia / Q000378:metabolism; D000818:Animals; D001693:Biological Transport, Active; D002712:Chlorides / Q000378:metabolism; D004175:Diptera / Q000378:metabolism*; D066298:In Vitro Techniques; D007422:Intestines / Q000502:physiology; D007477:Ions; D007814:Larva; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism
D002712:Chlorides; D007477:Ions; D000641:Ammonia; D012964:Sodium; D011188:Potassium