Eel esophagus as an osmoregulatory organ.
Ion and water permeabilities were measured in the isolated esophagus of the eel (Anguilla anguilla and A. japonica), and compared with those in the stomach and the intestine. The freshwater eel esophagus was impermeable both to Na+ and Cl- ions and to water, whereas permeabilities to the ions increa...
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ftpubmed:oai:pubmedcentral.nih.gov:430273 2023-05-15T13:27:44+02:00 Eel esophagus as an osmoregulatory organ. Hirano, T Mayer-Gostan, N 1976-04 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC430273 http://www.ncbi.nlm.nih.gov/pubmed/1063415 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC430273 http://www.ncbi.nlm.nih.gov/pubmed/1063415 Research Article Text 1976 ftpubmed 2013-08-30T00:05:24Z Ion and water permeabilities were measured in the isolated esophagus of the eel (Anguilla anguilla and A. japonica), and compared with those in the stomach and the intestine. The freshwater eel esophagus was impermeable both to Na+ and Cl- ions and to water, whereas permeabilities to the ions increased selectively after seawater adaptation. The ion permeabilities of both the freshwater and the seawater eel stomach were lower than in the seawater eel esophagus, although water permeability was greater than in the esophagus. Sea water enclosed in the lumen was diluted three times more efficiently in the seawater eel esophagus than in the stomach. The intestinal permeabilities were greater than those of the esophagus and the stomach, and increased after seawater adaptation. In the eel, ingested sea water seems to be diluted mainly in the esophagus by passive diffusion of the ions into the blood without addition of water. After further but less important dilution in the stomach with salt removal and with water addition, the water is absorbed by the intestine, following active absorption of the ions. Thus the eel in sea water is able to replace water lost osmotically by drinking hypertonic sea water. Text Anguilla anguilla PubMed Central (PMC) |
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Research Article Hirano, T Mayer-Gostan, N Eel esophagus as an osmoregulatory organ. |
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Research Article |
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Ion and water permeabilities were measured in the isolated esophagus of the eel (Anguilla anguilla and A. japonica), and compared with those in the stomach and the intestine. The freshwater eel esophagus was impermeable both to Na+ and Cl- ions and to water, whereas permeabilities to the ions increased selectively after seawater adaptation. The ion permeabilities of both the freshwater and the seawater eel stomach were lower than in the seawater eel esophagus, although water permeability was greater than in the esophagus. Sea water enclosed in the lumen was diluted three times more efficiently in the seawater eel esophagus than in the stomach. The intestinal permeabilities were greater than those of the esophagus and the stomach, and increased after seawater adaptation. In the eel, ingested sea water seems to be diluted mainly in the esophagus by passive diffusion of the ions into the blood without addition of water. After further but less important dilution in the stomach with salt removal and with water addition, the water is absorbed by the intestine, following active absorption of the ions. Thus the eel in sea water is able to replace water lost osmotically by drinking hypertonic sea water. |
format |
Text |
author |
Hirano, T Mayer-Gostan, N |
author_facet |
Hirano, T Mayer-Gostan, N |
author_sort |
Hirano, T |
title |
Eel esophagus as an osmoregulatory organ. |
title_short |
Eel esophagus as an osmoregulatory organ. |
title_full |
Eel esophagus as an osmoregulatory organ. |
title_fullStr |
Eel esophagus as an osmoregulatory organ. |
title_full_unstemmed |
Eel esophagus as an osmoregulatory organ. |
title_sort |
eel esophagus as an osmoregulatory organ. |
publishDate |
1976 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC430273 http://www.ncbi.nlm.nih.gov/pubmed/1063415 |
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Anguilla anguilla |
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Anguilla anguilla |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC430273 http://www.ncbi.nlm.nih.gov/pubmed/1063415 |
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1766400078526808064 |