The regulation of branchial blood flow in the blacktip reef shark, Carcharhinus melanopterus (Carcharhinidae: Elasmobranchii)

Chopin L.K. and Bennett M.B. (1995) The regulation of branchial blood flow in the blacktip reef shark, Carcharhinus melanopterus (Carcharhinidae: Elasmobranchii). Comparative Biochemistry and Physiology -- Part A: Physiology, 112 1: 35-41. doi:10.1016/0300-9629(95)00094-N


Author Chopin L.K.
Bennett M.B.
Title The regulation of branchial blood flow in the blacktip reef shark, Carcharhinus melanopterus (Carcharhinidae: Elasmobranchii)
Journal name Comparative Biochemistry and Physiology -- Part A: Physiology   Check publisher's open access policy
ISSN 0300-9629
Publication date 1995
Sub-type Article (original research)
DOI 10.1016/0300-9629(95)00094-N
Volume 112
Issue 1
Start page 35
End page 41
Total pages 7
Subject 1314 Physiology
Abstract The innervation of the branchial vasculature of the blacktip reef shark, Carcharhinus melanopterus, appears similar to that described for other elasmobranchs. Isolated perfused gill arch preparations were used in a study of vascular responses to branchial nerve stimulation. The pre-addition of 10-5 M concentrations of pancuronium to the perfusate prevented skeletal muscle contractions and significantly reduced (P < 0.001) changes in perfusion pressure in response to nerve stimulation. The adductor muscles received an extensive innervation by nerve fibres ramifying from the gill arch. In pharmacological studies, pancuronium completely antagonized the normal vasoconstrictive response to acetylcholine. At low concentrations, noradrenaline produced a vasoconstriction, but this changed to a vasodilatation at concentrations above 10-5 M. The use of antagonists demonstrated the presence of both α-, and β-adrenoceptors in the branchial vasculature. Anatomical studies failed to show adrenergic nerves in the gills, suggesting a lack of a spinal autonomic ('sympathetic') innervation. Adrenergic regulation of gill blood flow may involve the release of catecholamines into the blood stream from chromaffin tissue stores.
Keyword Adrenergic
Autonomic
Carcharhinus
Cholinergic
Gills
Shark
Vagus
Vasculature
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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