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Aspects of lymph-heart function in Rana catesbeiana

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Abstract:



The effect of voluntary dives on the posterior lymph heart rate of the bullfrog, Rana catesbeiana, was tested and compared with the blood-heart rate (n = 6). This was performed by cannulating the posterior lymph heart and femoral artery simultaneously. Blood-heart rates during submergence were significantly lower (α = 0.05) then pre-submergence rates at all sampling times. In contrast, the lymph hearts showed significantly lower rates only during the first and last submergence intervals. It is believed that the lymph-heart bradycardia found during these intervals is due in part to the physiological "preparations" for diving by the frog. Further information regarding posterior lymph heart contractions was gained by cannulating two posterior lymph hearts on one side of the frog (n = 5). It was found that these hearts beat within 100 ms of each other between 66 and 97% of the time (α = 0.05). The combined contraction of the three posterior lymph hearts could facilitate the movement of lymph through the outflow valve and into the venous circulation. This study represents the first time the axial coordination of homolateral lymph hearts has been shown to extend to the multiple posterior lymph hearts.

Nous avons étudié les effets de plongées volontaires sur le rythme du coeur lymphatique postérieur de Rana catesbeiana. Nous avons comparé ces résultats à ceux du rythme du coeur sanguin (n = 6) en canulant simultanément le coeur lymphatique postérieur et l'artère fémorale. Le rythme du coeur sanguin s'est avéré significativement plus bas (α = 0,05) durant qu'avant la plongée, à toutes les périodes d'échantillonnage. En revanche, les coeurs lymphatiques ont un rythme significativement plus bas seulement durant le premier et le dernier intervalles de la plongée. Cette bradycardie des coeurs lymphatiques dans ces intervalles serait due, croit-on, à la « préparation » physiologique de l'animal pour la plongée. En canulant deux coeurs lymphatiques postérieurs du même côté du ouaouaron (n = 5), nous avons obtenu des informations supplémentaires sur les contractions des coeurs lymphatiques postérieur : ces coeurs se contractent à intervalles de 100 ms l'un de l'autre, de 66 à 97 % du temps (α = 0,05). La combinaison des contractions des trois coeurs lymphatiques postérieurs peut faciliter le déplacement de la lymphe à travers la valve de sortie et vers la circulation veineuse. C'est la première fois qu'il est démontré que la coordination axiale des coeurs lymphatiques homolatéraux s'étend aux multiples coeurs lymphatiques postérieurs.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2002

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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