SYNCHRONIZATION OF FUNCTION IN THE FOREGUT OF THE BLOWFLYPHORMIA REGINA(DIPTERA: CALLIPHORIDAE) DURING THE CROP-EMPTYING PROCESS

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Abstract
The sequential mode of operation of the various valves and pumps in the foregut of the blowflyPhormia reginaMeigen is described for the crop-emptying process. The results of the study are discussed in relation to the results of Gelperin, who showed that the rate of crop emptying was determined by the crop volume and the blood solute concentration. A mechanism by which synchronization of function may be achieved, based on the results of Nagai, and Thomson and Holling, is proposed, i.e. synchronization depends on the activity of stretch-sensitive muscle fibres.