Read e-book online Cardiovascular Physiology: Microcirculation and Capillary PDF

By A. G. B. Kov`ch, J. Hamar and L. Szabó (Eds.)

ISBN-10: 0080268196

ISBN-13: 9780080268194

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Read or Download Cardiovascular Physiology: Microcirculation and Capillary Exchange. Proceedings of the 28th International Congress of Physiological Sciences, Budapest, 1980 PDF

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Extra info for Cardiovascular Physiology: Microcirculation and Capillary Exchange. Proceedings of the 28th International Congress of Physiological Sciences, Budapest, 1980

Sample text

In vivo, however, there are reports indicating that P G I ? produces an increase in arrhythmias in the r a t and cat after acute coronary artery occlusion (Au et a l , 1980; Kelliher et al, 1979; Dix et a l , 1979). However, in the anaesthetised dog an infusion of P G I ? (320 ng/kg/min) for 6 h starting 17 min after coronary occlusion did not alter i n f a r c t size (Ribeiro et a l , 1979). P G I 2 infusion at 420 n g / k g / m i n for 6 h in anaesthetized dogs starting 3 min after occlusion reduced the i n f a r c t size (Jugdutt et al, 1979).

_28: 220-231, 1902. [5] Borgstrom, P. and P. - 0 . Grande. Myogenic microvascular responses to change of transmural pressure. Acta Physiol. Scand. 106:411-423, 1979. [6] Bouskela, E. and C. Wiederhielm. Microvascular myogenic reaction in the wing of the intact, unanesthetized bat. Am. J. Physiol. 237:H59H65, 1979. [7] Bulbring, E. Correlation between membrane potential, spike discharge and tension in smooth muscle. J. , London 128:200-221, 1955. [8] Burgi, S. Zur Physiologie and Pharmacologie der'Überlebenden Arterie.

It is therefore conceivable that the sarcolemma in this region may function as a tension sensor. In this regard it may also be » « ^ ; studies of taenia coli [7] and strips of snail heart [1 , it has appeared that the magnitude of the contractile or electrical activity was better corrected with tension than with muscle length. In the case of taenia coli the length-tension relationship has considerable hysteresis When membrane potential is plotted against length this hysteresis is also present but hysteresis disappears when membrane potential is plottea against tension.

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Cardiovascular Physiology: Microcirculation and Capillary Exchange. Proceedings of the 28th International Congress of Physiological Sciences, Budapest, 1980 by A. G. B. Kov`ch, J. Hamar and L. Szabó (Eds.)


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