CIRCULATION IN THE HAGFISH, MYXINE GLUTINOSA L

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Abstract
The pressure relations in the vascular system of M. glutinosa show a low arterial pressure level correlating with the existence of a lacunar circulation. The average pressure in the dorsal aorta ranged from 3-8 mm Hg with a pulse pressure of around 25 mm H2O. The average pressure drop across the gills was approximately 4 mm Hg. The gills take an active part in the forward propulsion of arterialized blood. This is accomplished by contraction of striated muscular elements in the gills and gill ducts.

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