Abstract
Hagfish, Myxine glutinosa, were used in a series of experiments to determine a possible role for calcitonin in plasma and urine electrolyte balance. Individual animals were anaesthetised and implanted with polythene cannulae for monitoring blood pressure and for infusion/injection. Urine was collected by manual palpation of the body surface whilst blood samples were withdrawn from the lateral sinus. Following injection of either 1.25 or 3.75 μg kg body wt −1 calcitonin, there was no significant change in either the plasma or urine composition of sodium, potassium, calcium, or magnesium ion levels. These results indicate that calcitonin may not be involved in electrolyte homeostasis in Myxine.
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