The control of urine procuction in carcinus maenas
The control of urine procuction in carcinus maenas
Urine production in Carcinus was measured by three methods, clearance of radiotracers from the haemolymph, the loss of these tracers from thole animals and by continuous collection of urine via a cannula inserted into the excretory canal. The results suggest that earlier measurements of urine production by crabs in sea water may be too high. The techniques were used to investigate the mechanism by which urine production increases following transfer of crabs from sea water to dilute sea water media. The increase in urine production occurs within minutes of transfer and appears to be controlled via direct monitoring of the medium salinity rather than in response to changes in internal pressure. The development of a technique for perfusion of the antennal gland while simultaneously recording the urine flow rate enabled the mechanism producing changes in urine volume to be elucidated. Firstly the, rate of urine flow is directly proportional to the pressure in the antennary artery which in turn would vary with cardiac output. Secondly it was possible to demonstrate the presence in the cerebral ganglion of substances capable of increasing urine flow by altering the permeability of the antennal gland. It is likely that this horau:nal system plays the major role since the scope for raising arterial pressure is limited.
University of Southampton
Norfolk, James Robert Waller
1976
Norfolk, James Robert Waller
Norfolk, James Robert Waller
(1976)
The control of urine procuction in carcinus maenas.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Urine production in Carcinus was measured by three methods, clearance of radiotracers from the haemolymph, the loss of these tracers from thole animals and by continuous collection of urine via a cannula inserted into the excretory canal. The results suggest that earlier measurements of urine production by crabs in sea water may be too high. The techniques were used to investigate the mechanism by which urine production increases following transfer of crabs from sea water to dilute sea water media. The increase in urine production occurs within minutes of transfer and appears to be controlled via direct monitoring of the medium salinity rather than in response to changes in internal pressure. The development of a technique for perfusion of the antennal gland while simultaneously recording the urine flow rate enabled the mechanism producing changes in urine volume to be elucidated. Firstly the, rate of urine flow is directly proportional to the pressure in the antennary artery which in turn would vary with cardiac output. Secondly it was possible to demonstrate the presence in the cerebral ganglion of substances capable of increasing urine flow by altering the permeability of the antennal gland. It is likely that this horau:nal system plays the major role since the scope for raising arterial pressure is limited.
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Published date: 1976
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Local EPrints ID: 458313
URI: http://eprints.soton.ac.uk/id/eprint/458313
PURE UUID: 62416039-23d7-4716-8b33-2fe15fed65b4
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Date deposited: 04 Jul 2022 16:46
Last modified: 04 Jul 2022 16:46
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Author:
James Robert Waller Norfolk
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