title: Neurohumors versus neurosecretion in the snail heart.
mesh_terms: D000818:Animals; D006321:Heart / Q000502:physiology*; D008854:Microscopy, Electron; D009206:Myocardium / Q000648:ultrastructure*; D009489:Neurosecretion; D018377:Neurotransmitter Agents / Q000378:metabolism*; D012908:Snails / Q000033:anatomy & histology* / Q000502:physiology
chemical_list: D018377:Neurotransmitter Agents