Possible Gibbs-Donnan mechanism for cation uptake.
D000818:Animals; D001693:Biological Transport, Active; D002118:Calcium / Q000378:metabolism; D002414:Cations, Monovalent; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D008954:Models, Biological; D010539:Permeability; D012908:Snails / Q000378:metabolism
D002414:Cations, Monovalent; D002118:Calcium