THE INFLUENCE OF HEMORRHAGE ON SKELETAL MUSCLE TONE

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Abstract
Hemorrhage leads in unanesthetized, decerebrate dogs to a rise in muscle tone which is reversed on reinfusion of the blood. Adrenalin raises blood pressure and muscle tone but ephedrine is without effect on the muscle tone in concs. which have a decided pressor effect. Hemorrhage causes a rise in muscle tone even when a fall in blood pressure is prevented by simultaneous inj. of ephedrine. Bilateral de-nervation of the carotid sinus area does not prevent the rise in muscle tone during hemorrhage. It is assumed that the increase in muscle tone in hemorrhage is an important reaction of the somatic nervous system which contributes to circulatory adjustment.

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