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Figure 5


Fig. 5. Exposing the inactive anterior foreguts isolated from early-molt stage larvae to crustacean cardioactive peptide (CCAP) triggers a dramatic increase in anterior foregut motility. (A,B) Examples of anterior foregut activity in saline conditions (A) and of the same preparation after 3 min in 10–8 mol l–1 CCAP (B). The top trace is the endogenous activity recorded by a movement transducer attached to the anterior esophageal constrictor muscle group. The bottom trace is a concurrent extracellular recording of excitatory junctional potentials (EJPs) from the esophageal constrictor muscles. (C) Within 30 min of the CCAP application to the anterior foreguts isolated from larvae early in the molt cycle, the average contraction amplitude increased significantly (P<0.05, paired t-test) to levels similar to that observed around the time of molting fluid ingestion. *Significant difference from the initial saline contraction levels.





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