title: Conduction system in a sponge.
abstract: The hexactinellid sponge Rhabdocalyptus dawsoni is capable of arresting its exhalant water current in response to mechanical and electrical stimuli. The arrest is coordinated by a conduction system with a precise threshold of excitability and a chronaxie of 38 milliseconds. The response is propagated throughout the sponge at a mean velocity of 0.22 centimeter per second, and conduction is unpolarized.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D002450:Cell Communication; D004558:Electric Stimulation; D004594:Electrophysiology; D009431:Neural Conduction; D011161:Porifera / Q000502:physiology*; D014867:Water / Q000502:physiology
chemical_list: D014867:Water