The in vivo dissociation of colonic and coprodeal transepithelial transport in NaCl depleted domestic fowl

Rice, G. E. and Skadhauge, E. (1982) The in vivo dissociation of colonic and coprodeal transepithelial transport in NaCl depleted domestic fowl. Journal of Comparative Physiology, 146 1: 51-56. doi:10.1007/BF00688716


Author Rice, G. E.
Skadhauge, E.
Title The in vivo dissociation of colonic and coprodeal transepithelial transport in NaCl depleted domestic fowl
Journal name Journal of Comparative Physiology   Check publisher's open access policy
ISSN 0174-1578
1432-136X
Publication date 1982
Sub-type Article (original research)
DOI 10.1007/BF00688716
Volume 146
Issue 1
Start page 51
End page 56
Total pages 6
Place of publication Berlin, Germany
Publisher Springer
Language eng
Formatted abstract
1. The contributions made by the coprodeum and by the colon to transepithelial transport were assessed in vivo, in the domestic fowl. Functional differences were established between these two epithelia that were neither revealed by previous in vitro nor in vivo studies.

2. With iso-osmotic perfusion, net colonic sodium ion flux (mucosa→serosa) was five times greater than the flux measured in coprodeum, JNa=100±24 μEq/kg·h and 19±6.3 μEq/kg·h, respectively.

3. Concomitant with net sodium ion flux was a solute-linked water flow, which in the colon averaged 176±34 μl/kg·h, but was virtually undetectable in the coprodeum (13±11 μl/kg·h).

4. Net chloride ion absorption accompanied sodium ion transport and was significantly higher in the colon than in the coprodeum (P<0.01).

5. Sodium transport-independent K+ secretion (serosa→mucosa) was observed with all treatments and in both coprodeum and colon. The magnitudes of the fluxes were not significantly different.

6. The coprodeum functions as a storage site for ureteral urine. Active modification of water and electrolyte composition of urine and chymus takes place almost exclusively in the colon.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: UQ Centre for Clinical Research Publications
 
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