Male 8 Phenoxybenzamine phenoxybenzamine 8 Animal 6 Rats 6 Support, Non-U.S. Gov't 6 alpha adrenergic receptor 6 animal experiment 6 autonomic nervous system 6 drug efficacy 6 nonhuman 6 rat 6 Ganglia, Sympathetic 4 Methoxamine 4 Norepinephrine 4 Rats, Inbred Strains 4 Receptors, Adrenergic, alpha 4 adrenergic receptor 4 drug comparison 4 drug mechanism 4 endocrine system 4 ganglionectomy 4 methoxamine 4 propranolol 4 radioisotope 4 subcutaneous drug administration 4 superior cervical ganglion 4 Animals 2 Arteries 2 Arthropod Venoms 2