Methylxanthines, adenosine and the pulmonary system.
D000241:Adenosine / Q000502:physiology*; D006801:Humans; D008168:Lung / Q000187:drug effects* / Q000502:physiology; D011983:Receptors, Purinergic / Q000187:drug effects; D014970:Xanthines / Q000494:pharmacology*
D011983:Receptors, Purinergic; D014970:Xanthines; C008514:methylxanthine; D000241:Adenosine