From muscles to motivation.
D000818:Animals; D001519:Behavior / Q000502:physiology*; D002415:Cats; D003058:Cockroaches; D005246:Feedback; D007313:Insecta; D009042:Motivation / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology; D009132:Muscles / Q000502:physiology*; D009424:Nervous System Physiological Phenomena; D011817:Rabbits; D051381:Rats; D012018:Reflex / Q000502:physiology; D012908:Snails