title: Structural and functional aspects of salivary fluid section in Calliphora.
abstract: Calliphora salivary glands are described, emphasizing correlations between structure and physiology. In vitro studies show that the distal part of each gland produces a potassium-rich primary saliva when stimulated with 5-hydroxytryptamine or cyclic AMP. The secretory cells have elaborate canaliculi opening into the lumen. Stimulation of the secretory region causes a 60-fold increase in fluid secretion rate without affecting cell structure. The proximal part of the gland reabsorbs potassium when stimulated with cyclic AMP, but 5-HT has no effect. Potassium reabsorption from the primary saliva results in formation of a dilute saliva. The structure of the secretory and reabsorptive cells is discussed with regard to the functional role of long narrow channels in transport.
authors.affiliation: Institute of Biological Chemistry, University of Copenhagen, Copenhagen K, Denmark.
authors.forename: J L
authors.initials: JL
authors.lastname: Oschman
authors.forename: M J
authors.initials: MJ
authors.lastname: Berridge