title: Prejunctional alpha 2 adrenoceptors inhibit contraction of tracheal smooth muscle by inhibiting cholinergic neurotransmission.
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology; D000403:Airway Resistance / Q000187:drug effects*; D000818:Animals; D004558:Electric Stimulation; D006168:Guinea Pigs; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology; D010275:Parasympathetic Nervous System / Q000187:drug effects*; D011941:Receptors, Adrenergic / Q000502:physiology*; D011942:Receptors, Adrenergic, alpha / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects*; D014132:Trachea / Q000502:physiology
chemical_list: D000317:Adrenergic alpha-Antagonists; D011941:Receptors, Adrenergic; D011942:Receptors, Adrenergic, alpha; D009638:Norepinephrine