Related Experiment Video
Updated: Aug 14, 2026

06:47
Measures of Heart and Ventilatory Rates in Freely Moving Crayfish
Published on: October 15, 2009
Neurohemal organ extracts effect the ventilation oscillator in crustaceans
The Journal of Experimental Zoology
|January 1, 1976
Abstract:
Extracts of the pericardial organs of crabs injected into intact animals cause an increase in the frequency of scaphognathite beating. The active factor is not dopamine of 5-hydroxytryptamine, which are present in pericardial organs; it is probably a peptide. The factor may represent a hormonal mechanism of coordinating heart rate and ventilation.

