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By J.E. Treherne

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J. BERRIDGE AND W. T. PRINCE a -20- -10 - 0- > E +lo- +20 - t30 - b I 0 ~ 1 I 2 I 1 3 4 5 Minutes ' 6 ' 7 ' ' 8 Fig. 18. a. 'Ihe response of an isolated salivary gland to treatment with 1 x lO-'M 5-HT for 15 s (horizontal bar). b. Hypothetical curves illustrating the proposed changes in internal and cyclic AMP (---) concentrations during the response shown in a. The calcium (-) stippling represents the period when cyclic AMP acts in the absence of calcium which may account for the positive phase of the biphasic response in a.

And Clausen, T. (1968). Membrane potential of brown adipose tissue. J. gen. Physiol. 52, 925-940. Goldberg, A. L. and Singer, J. J. (1969). Evidence for the role of cyclic AMP in neuromuscular transmission. Proc. natn. Acad. Sci. A. 64, 134-141. Greenberg, M. J. (1 960). Structure-activity relationships of tryptamine analogues on the heart of Venus mercenaria. Brit. J. Pharmac. 15,375-388. Handler, J. , Butcher, R. , Sutherland, E. W. and Orloff, J. (19651, The effect of vasopressin and of theophylline on the concentration of adenosine 3’,5’-phosphate in the urinary bladder of the toad.

197 1). The situation regarding sodium transport is less clear. Sodium transport probably occurs through the mitochondria-rich cells and/or the granular cells. The latter cell type is the more plentiful but the mitochondria-rich cells appear to be more suited to active transport-they have many mitochondria and have microvilli thus resembling the parietal cells of the stomach (Choi, 1963). , 1971). Frazier suggests that the granular cells participate in ADH stimulated sodium transport whilst the mitochondria-rich cells are more suited to stimulation by aldosterone.

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