Portland State University. Department of Biology
Stanley S. Hillman
Date of Award
Master of Science (M.S.) in Biology
1 online resource (61 p.)
Lymphatics, Blood volume, Bufo marinus -- Physiology, Toads -- Physiology
Currently published data on the role of the lymphatic system in amphibians are inadequate and contradictory. Estimates of the rate of formation of lymph and the role of the lymph hearts in returning this fluid to the circulation are not based on actual volume determinations but rather estimates derived from changes in hematocrit using published values of plasma and blood volume. The lymph hearts are known to be vital to the maintenance of normal fluid compartment physiology and to increase their rate of activity during episodes of hypovolemic stress. Yet, significant redistribution of body fluids following hemorrage appears to occur in animals without lymph hearts.
In this study, plasma and blood volumes were determined by the dye dilution technique using injected Evan's blue dye to label the plasma. Eight intact and 6 animals with their lymph hearts destroyed were hemorrhaged to 78% and 75% of their initial blood volumes, respectively. Changes in blood volume were measured following the hemorrhage by analysis of Evan's blue washout and hemodilution.
Baustian, Mark, "The contribution of the lymph hearts in compensation for acute hypovolemic stress in the toad Bufo marinus" (1986). Dissertations and Theses. Paper 3517.