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First published online August 25, 2003

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The Journal of Experimental Biology 206, 3327-3335 (2003)
doi: 10.1242/jeb.00576

Form and function of the bulbus arteriosus in yellowfin tuna (Thunnus albacares): dynamic properties

Marvin H. Braun^1,*, Richard W. Brill², John M. Gosline³ and David R. Jones⁴

¹ Department of Zoology, Cambridge University, Downing Street, Cambridge, UK, CB2 3EJ,
² Cooperative Marine Education and Research Program, Virginia Institute of Marine Science, PO Box 1208, Greate Rd, Gloucester Point, Virginia 23062, USA,
³ Department of Zoology, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4
⁴ Zoology Animal Care, 6199 South Campus Road, University of British Columbia, Vancouver, BC, Canada, V6T 1W5

^* Author for correspondence (e-mail: mhb31{at}cam.ac.uk)

Accepted 27 June 2003

The bulbus arteriosus of the teleost heart possesses a static inflation curve that is r-shaped over the in vivo pressure range. To examine the possible significance of this in living animals, we recorded arterial blood pressure from anaesthetized yellowfin tuna and utilized a video dimensional analyser to simultaneously record changes in bulbar diameter. By plotting the changes in pressure against the changes in diameter, it was possible to create dynamic pressure-diameter (P-D) loops as well as calculate the instantaneous volume changes within the bulbus. The dynamic P-D loops showed the same features exhibited by static inflation. When nearly empty, a small stroke volume caused a large increase in blood pressure, while around systolic pressure large changes in volume resulted in small changes in pressure. We conclude that these features allow the bulbus to maintain ventral aortic flows and pressures over a large range of volumes.

Key words: bulbus arteriosus, P-D loop, r-shaped curve, video dimensional analysis, tuna, Thunnus.

This article has been cited by other articles:

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