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Urea excretion and diving in the seal (Phoca vitulina L.)

โœ Scribed by Schmidt-Nielsen, Bodil ;Murdaugh, H. V. ;O'Dell, Roberta ;Bacsanyi, J.

Publisher
Wiley (John Wiley & Sons)
Year
1959
Tongue
English
Weight
912 KB
Volume
53
Category
Article
ISSN
0095-9898

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โœฆ Synopsis

The seal shows interesting physiological adaptations to its environment and diving habits. To the renal physiologist the circulatory changes that take place during diving and the changes in renal function accompanying feeding have been of particular interest.

It was shown by Hiatt and Hiatt ( '42) that the glomerular filtration rate (GFR) and renal plasma flow (RPF) increase considerably three to 4 hours after feeding. The lability of the renal function of the seal was further demonstrated by Bradley and Bing ('42) who found that the GFR and R P F could be reduced to approximately one fifth of the resting value if the respiration was arrested (simulated diving) by holding a cone over the nostrils of the seal.

Findings on the urea excretion of the seal by Smith ('36) suggested to us that the urea clearance might also be more labile than in other mammals. From Smith's data it can be calculated that in the fasting seal the urea/inulin clearance ratio is quite low (5-8%). Furthermore, Smith ('36) found that the ingestion of 1 kg of herring causcd the urine flow

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and the Depnrtments of Medicine and Physiology, S c w Fork. University College of Medin'ne THREE FIGURES Irving aiicl his collaborators (Irving, '39 ; Irving, et al., '42) have demonstrated that the seal, like other diving mammals, can survive long periods of asphyxia during diving by a coordinated

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The harbor seal (Phoca vitulina, L.) must tolerate repeated periods of asphyxia as a consequence of the apnea of diving. Irving, Scholander and Grinnell ( '42) have shown that the hemodynamic responses to diving involve the development of bradycardia and diminution of blood flow through the muscles