Nature of differential sympathetic discharges in chemoreceptor reflexes
نویسندگان
چکیده
منابع مشابه
Spinal sympathetic cardiocardiac reflexes.
We studied the reflex changes in myocardial contractility elicited by electrical stimulation of afferent cardiac sympathetic nerve fibers or chemical stimulation of their cardiac endings. Veratridine injected directly into the left coronary artery was the chemical stimulus. The maximum rate of rise of left ventricular pressure, dP/dt max, was used as an index of myocardial contractility. The st...
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The aim of this study was to test the hypothesis that capsaicin treatment in lambs selectively inhibits bronchopulmonary C-fiber function but does not alter other vagal pulmonary receptor functions or peripheral and central chemoreceptor functions. Eleven lambs were randomized to receive a subcutaneous injection of either 25 mg/kg capsaicin (6 lambs) or solvent (5 lambs) under general anesthesi...
متن کاملBaroreceptor and chemoreceptor influences on sympathetic discharge to the heart
DOWNING, S. EVANS, AND JOHN H. SIEGEL. Baroreceptor and chemoreceptor in.uences on sympathetic discharge to the heart. Am. J. Physiol. 2o&) : 47 I -479. I g63.--Baroreceptor and chemoreceptor influences in the regulation of sympathetic discharge to the heart were investigated, utilizing electroneurographic recordings from the left inferior cardiac nerve in the cat. Spontaneous discharge pattern...
متن کاملFunctional interaction between angiotensin and sympathetic reflexes in cats.
1. Lower-body negative pressure (LBNP) was used to stimulate sympathetic reflexes in anaesthetized cats. At -50 mmHg for 10 min it caused transient reduction in central venous pressure and systemic arterial blood pressure. Arterial blood pressure was then restored within 30 s and there was a tachycardia. Central venous pressure showed only partial recovery. The resting level of plasma renin act...
متن کاملAngiotensin activates sympathetic reflexes in the anaesthetized cat.
1. Lower-body subatmospheric pressure has been used to stimulate sympathetic reflexes in anaesthetized cats and the effects of an angiotensin converting enzyme inhibitor and [Sar1, Ala8]angiotensin II have been investigated on this reflex. 2. At the prevailing level of renin activity (2.9-3.2 ng of angiotensin I h-1 ml-1) the converting enzyme inhibitor had no effect on blood pressure yet it po...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1978
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.75.10.5239