The emetic reflex in a reptile (Crocodylus porosus)

Andrews, P. L. R., Axelsson, M., Franklin, C. and Holmgren, S. (2000) The emetic reflex in a reptile (Crocodylus porosus). The Journal of Experimental Biology, 203 10: 1625-1632.

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Author Andrews, P. L. R.
Axelsson, M.
Franklin, C.
Holmgren, S.
Title The emetic reflex in a reptile (Crocodylus porosus)
Journal name The Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
1477-9145
Publication date 2000-05-01
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 203
Issue 10
Start page 1625
End page 1632
Total pages 8
Place of publication Great Britain
Publisher The Company of Biologists
Collection year 2000
Language eng
Subject 270603 Animal Physiology - Systems
780105 Biological sciences
Abstract The emetic (vomiting) reflex in a crocodilian, Crocodylus porosus, was characterised for the first time using the plant alkaloid veratrine (5 mg kg(-1) i.v. or i.p.) as an emetic stimulus. The latency to the onset of vomiting was 8.0+/-0.9 min (mean +/- S.E.M., N=5 animals). Vomiting was preceded by a clearly defined set of prodromal behaviours including, in temporal sequence, rhythmic contraction of the pharynx, sneezing and jaw snapping. Expulsion of vomitus was not particularly forceful and was accompanied by lateral shaking of the head. Physiological studies revealed that vomiting was accompanied by oscillatory (9.1+/-0.7 oscillations over 29.7+/-3.6 s, N=9 episodes in three animals) increases in intraperitoneal pressure (7.0+/-0.9 kPa, cf, 0.7+/-0.1 kPa during respiration). The significance of these results is discussed in the context of the role(s) of vomiting as a protective reflex and as a mechanism for removal of indigestible food residues (e.g. fur, claws) from the gut.
Keyword Biology
Estuarine Crocodile
Crocodylus Porosus
Reptile
Veratrine
Emesis
Scyliorhinus-canicula
Digestion
Amphibians
Dogfish
Dog
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
 
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Created: Tue, 10 Jun 2008, 22:03:16 EST