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Biol Bull 118: 289-295. (April 1960)
© 1960 Marine Biological Laboratory
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CIRCULATION IN THE HAGFISH, MYXINE GLUTINOSA L

KJELL JOHANSEN 1

1 University of Oslo, Institute for Experimental Medical Research, Oslo, Norway

1. Electromanometers have been used to study the pressure relations in the vascular system of Myxine glutinosa L.

2. The data demonstrate a low arterial pressure level in this species correlating with the existence of a lacunar circulation.

3. 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, calculated from the average pressures in the heart ventricle and dorsal aorta, was found to be around 4 mm. Hg.

4. The gills have been shown to take active part in the forward propulsion of arterialized blood. This is accomplished by contraction of striated muscular elements in the gills and gill ducts.

5. It is concluded that the circulation in Myxine differs from circulation in vertebrates generally by a partial shifting of the blood-moving power from the systemic heart to the gills and the portal, cardinal and caudal auxiliary hearts.






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Copyright © 1960 by the Marine Biological Laboratory.