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Some aspects of hemodynamics inNautilus pompilius

✍ Scribed by Bourne, George B. ;Redmond, James R. ;Johansen, Kjell

Publisher: John Wiley and Sons
Year: 1978
Tongue: English
Weight: 546 KB
Volume: 205
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402050109

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✦ Synopsis

Blood pressure recordings from the ventricle, dorsal aorta, dorsal hemocoel, vena cava, afferent and efferent branchial veins show that the Nautilus pompilius cardiovascular system possesses similar functional characteristics to those of the modern coleoid cephalopods. In free swimming animals a t 17" C & 1' the contraction rate of the systemic ventricle varied between 5 and 18 beats per minute. Systolic blood pressure averaged 35 cm HzO while diastolic pressure averaged 16 cm H 2 0 in the dorsal aorta. Peak and low pressures in the afferent branchial vein were 9 cm HzO and 1 cm HzO respectively while the mean pressure in the efferent branchial vein was 2 cm HzO and in the vena cava it was 2.2 cm HzO.

The contour of the flow pulse recorded from the dorsal aorta indicated a backflow marking the point of aortic valve closure.

Hemodynamics of the Nautilus pompilius cardiovascular system are discussed.

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