By G.F. Ball, J. Balthazart, M. Hidaka, I. Novak, M. Wheatly
Advances in Comparative and Environmental Physiology is helping biologists, physiologists, and biochemists preserve song of the huge literature within the box. supplying accomplished, built-in reports and sound, severe, and provocative summaries, this sequence is a needs to for all energetic researchers in environmental and comparative physiology.
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Extra resources for Advances in Comparative and Environmental Physiology
In contrast to the rabbit, the rat mandibular gland secretes well in response to a ~-adrenergic stimulation (Fig. 1). Ductal K+ secretion is markedly enhanced by phenylephrine (to 80-90mmolll) and even more so by isoproterenol (to 90-120mmolll) (Novak 1984). The effects on Na+ transport, however, are minimal. Thus, it seems that there are discrepancies between whole gland and main duct studies, which become especially obvious with cholinergic stimulation. This might be explained if in the whole gland the infused agonist causes secondary effects due to the release of biologically active substances present in the gland.
The specific function of various intralobular ducts (intercalated, striated, granular and intralobular excretory ducts) in the production of final saliva remains unclear, no doubt due to their relative inaccessibility for physiological studies. Hence, up to date the gross role of salivary ducts has been derived from two types of studies, those of whole glands and main extralobular ducts. In whole gland studies, assuming that the primary saliva remains unaltered during stimulation, changes in the ion concentration of final saliva with the secretory rate, so-called "excretory patterns" (Fig.
Electrolyte excretory patterns of cholinergically stimulated salivary glands. Salivary electrolyte concentrations are plotted as a function of salivary secretory rates corrected for gland weight. Data for rat and rabbit mandibular glands are redrawn from Novak (1984), for Na+-replete sheep parotid glands from Compton et al. (1980) and for Na+ -replete kangaroo parotid glands from Beal (1984) 29 Cellular Mechanisms of Salivary Gland Secretion Bicarbonate ;---.. 200 "0 E E kangaroo P. 150 ~ 7 '--" c 100 0 - +- 0 L +- c Q) () c 0 50 0 U sheep P.