Circulation in Skeletal Muscle. Proceedings of an by O. Hudlicka

By O. Hudlicka

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Additional resources for Circulation in Skeletal Muscle. Proceedings of an International Symposium Held at Smolenice, Czechoslovakia, 1966

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Clin. Sei. 18, 9. DAWES, G . , and FASTIER, F . N . (1950) Reflex actions of some isothiourea derivatives on circulation and respiration. Brit. J. Pharmacol. 5, 323. MEIER, R . , BEIN, H . J . and HELMICH, H . (1949) Zur Wirkung des Veratrins auf die vagale Atemsteuerung des Kaninchens. Experientia, 5, 484. PAINTAL, A . S . (1955) Impulses in vagal aff'erent fibres from specific pulmonary deflation receptors. The response of these receptors to phenyldiguanide, potato starch, 5-hydroxytryptamine and nicotine, and their role in respiratory and cardiovas­ cular reflexes.

These experiments indicated that the vasodilatation induced by vasodilator nerve activity may be of physiological significance only during low vasoconstrictor tone. We have performed experiments on conscious and anaesthetized dogs in order to further elucidate the interaction between the two vasomotor 43 44 S. ROSELL, P. BOLME AND S. H. NGAI systems. The vasodilator outflow to skeletal muscle vessels was activ­ ated by electrical stimulation in the hypothalamus or the mesence­ phalon. On conscious dogs the blood flow was measured by means of an electromagnetic flowmeter probe placed around the external iliac artery.

Blood flow distal to the insertion of the catheter in the femoral artery of the recipient was monitored. Veratridine, phenyldiguanide and lobehne were used to represent the three classes of sensory stimulatory drugs. When injected into the right atrium in submaximal reflex hypotensive doses, an increase in femoral flow was seen 1-2 sec after the beginning of reflex bradycardia in nineteen out of a total of twenty experiments. In the single animal experiments after the injection of these reflexogenic compounds, flow frequently increased above control levels despite a concomitant fall in arterial pressure (Figs.

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