Is yawning a cholinergic response?
D000367:Age Factors; D000818:Animals; D001921:Brain / Q000187:drug effects / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D008297:Male; D009388:Neostigmine / Q000494:pharmacology; D010275:Parasympathetic Nervous System / Q000502:physiology*; D010830:Physostigmine / Q000494:pharmacology*; D051381:Rats; D011950:Receptors, Cholinergic / Q000187:drug effects; D011976:Receptors, Muscarinic / Q000187:drug effects; D012018:Reflex; D012119:Respiration / Q000187:drug effects; D012737:Sex Factors
D011950:Receptors, Cholinergic; D011976:Receptors, Muscarinic; D009388:Neostigmine; D010830:Physostigmine