Browsing by Subject "Noradrenalin"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Publication
    Open Access
    A morphometric study of the secretory granules of the granular duct in the submaxillary gland of the rat following stimulation with noradrenalin and isoproterenol
    (Murcia : F. Hernández, 1990) Gutiérrez, M.S.; Galera, H.; Bullón, P.; Hevia, A.; Dorado, M. E.
    In the present work, we carry out a morphometric analysis, at ultrastructural level, of the secretory granules of the granular undulated duct of the submaxillary gland of the rat, under basal conditions (Control Group or I), following stimulation for 10 minutes with 2 mg1100 g weight of Isoproterenol (Group 11), and following stimulation with 2 gamrnas/100 g weight of Noradrenalin for the same time as in the former case. It is seen that in general, Noradrenalin produces the appearance of a greater number of small granules than does Isoproterenol or the control group; and that Isoproterenol induces the presence of larger-sized granules than does Noradrenalin.
  • Thumbnail Image
    Publication
    Open Access
    Morphodynamic response of the rat light pinealocytes to an injection act. lmplication of O-adrenoreceptors
    (Murcia : F. Hernández, 1992) Milin, J.; Djakovic-Svajcei, K.; Vuzevski, V.D.; Milin, R.
    The implication of B-adrenoreceptormediated noradrenalin action on the reactive morphodynamic response of light pinealocytes (LP) to an injection act, conceived as a short-lasting stress attack, is reported. An injection act, realized by saline-injection, was manifested in the occurrence of clustered «dusk» and «bright» cells - the representative forms of functionally activated LP. The time-related incidence of these cells entities - the appearance of «dusk» and «bright» cells at 5 min, transitory domination of «bright» cells and the nadir of «dusk» cells at 20 min, sporadic recognition of «bright» cells, lack of «dusk» cells at 45 min and the absence of both cell forms at 180 min - displayed that LP-reactive response promptly appeared and rapidly ceased. The injection of B-adrenoreceptor antagonist, propranolol, did not considerably alter the pattern of LP-reactive response proper for saline-injected rats at 5 min. The constant presence of «dusk» and «bright» cells, structurally changed in al1 the following time periods under investigation, showed that this drug disordered the course of LP-reactive response to an injection act. On the contrary, LP of resting state was not found to be affected. Estimating functionally, the present results indicate that B-adrenoreceptormediated noradrenalin action is required to promote, maintain and accomplish the LP-reactive response to a short-lasting stress inducement.