The neuron.
D000109:Acetylcholine / Q000502:physiology; D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002415:Cats; D007473:Ion Channels / Q000502:physiology; D009469:Neuromuscular Junction / Q000502:physiology / Q000648:ultrastructure; D009474:Neurons / Q000502:physiology* / Q000648:ultrastructure; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism; D013569:Synapses / Q000502:physiology / Q000648:ultrastructure; D014793:Visual Cortex / Q000502:physiology
D007473:Ion Channels; D012964:Sodium; D000109:Acetylcholine; D011188:Potassium; D002118:Calcium