title: Effects of drugs and ions on a primitive system of spontaneous contractions in a sponge (Euspongia officinalis).
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D004837:Epinephrine / Q000494:pharmacology*; D008274:Magnesium / Q000494:pharmacology*; D008854:Microscopy, Electron; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology*; D011161:Porifera / Q000187:drug effects / Q000502:physiology*; D011188:Potassium / Q000494:pharmacology*; D012623:Seawater; D012964:Sodium / Q000494:pharmacology*; D013268:Stimulation, Chemical
chemical_list: D012964:Sodium; D008274:Magnesium; D000109:Acetylcholine; D011188:Potassium; D002118:Calcium; D004837:Epinephrine