Carbon dioxide.
D000136:Acid-Base Equilibrium; D000759:Adjuvants, Anesthesia; D000758:Anesthesia; D001921:Brain / Q000187:drug effects; D002245:Carbon Dioxide / Q000494:pharmacology; D006801:Humans; D006935:Hypercapnia; D012119:Respiration; D012137:Respiratory System
D000759:Adjuvants, Anesthesia; D002245:Carbon Dioxide