The following receptor has an intrinsic ion channel:
A. Histamine H1 receptor
B. Histamine H2 receptor
C. Adrenergic alfa receptor
D. GABA-benzodiazepine receptor
A. Histamine H1 receptor
B. Histamine H2 receptor
C. Adrenergic alfa receptor
D. GABA-benzodiazepine receptor