levels of radioactivity in blood , brain , liver and lung were measured 5 , 15 , 30 and 60 min after administration of either propranolol or atenolol ( 1.0 mg/kg , i.v . ) to both conscious and anaesthetised rats and a tendency towards high tissue levels of radioactivity was found in the animals which received the beta-adrenoceptor antagonists under anaesthesia .
C0006104
brain
C0234421
conscious