Neural control of heartbeat in the leech, Hirudo medicinalis.
D000200:Action Potentials; D000818:Animals; D006321:Heart / Q000294:innervation*; D007395:Interneurons / Q000502:physiology; D007865:Leeches / Q000502:physiology*; D008564:Membrane Potentials; D009046:Motor Neurons / Q000502:physiology; D009200:Myocardial Contraction; D013569:Synapses / Q000502:physiology