title: Information and energy flow in a simple nervous system.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000502:physiology; D002490:Central Nervous System / Q000502:physiology*; D004735:Energy Transfer; D007257:Information Theory; D007865:Leeches / Q000502:physiology*; D008564:Membrane Potentials; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology; D011188:Potassium / Q000502:physiology; D013816:Thermodynamics
chemical_list: D011188:Potassium; D002118:Calcium