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Cardiac Function in the Hagfish, Myxine (Myxinoidea:Cyclostomata)
Author(s) -
Satchell Geoffrey H.
Publication year - 1986
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1986.tb00855.x
Subject(s) - hagfish , sinus venosus , biology , ventricle , medicine , anatomy , cardiology , ventricular pressure , blood pressure , endocrinology , vertebrate , biochemistry , gene
The electrocardiogram of Myxine glutinosa is described and its events related to systole in the sinus venosus, atrium and ventricle. Intraatrial, ventricular, ventral aortic and dorsal aortic pressures are presented. Ventricular systolic pressure was 10.3 ± 2.0 cm H 2 O; average dorsal aortic pressure was 7.0 ± 1.7 cm H 2 O. The resistance of the gill vessels caused a loss of 28% of the ventral aortic pressure. The conclusion is drawn that the basic mechanism of the heart of Myxine is like that of fish and higher vertebrates, and that the low pressure it develops is to be ascribed to structural and functional features of the myocardium.