title: Ultrastructure and electrical activity in developing heart cells (insect).
mesh_terms: D000200:Action Potentials; D000818:Animals; D012831:Bombyx / Q000502:physiology*; D006321:Heart / Q000502:physiology*; D008675:Metamorphosis, Biological; D008854:Microscopy, Electron; D009200:Myocardial Contraction; D009206:Myocardium / Q000648:ultrastructure*; D013997:Time Factors