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Abstract Myogenic contractions of the heart of the female blood‐feeding insect, Rhodnius prolixus (Stål), are inhibited by crude extracts of testes applied directly to isolated dorsal vessels. Dorsal vessels were observed with a stereo microscope and heart beats timed with a stopwatch. In normal Rhodnius saline, hearts contract at 14.8 ± 7.1 beats per minute (n= 45). Crude extracts of the testes...
Proctolin is a neuroactive pentapeptide first isolated from the cockroach Periplaneta americana in which it has an excitatory effect on contractions on visceral muscles of the hindgut. Subsequently, proctolin is reported in a wide variety of invertebrates, and considerable efforts have been made to determine its mode of action. Its primary role appears to be that of a neuromodulator rather than a...
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