pa2 determinations in the chick biventer cervicis muscle , the guinea-pig atria and guinea-pig ileum showed that the bisquaternary compounds chandonium , hs-626 and hs-627 were much more potent in blocking cardiac than intestinal muscarinic receptors and that hs-626 possessed the widest margin between concentrations blocking the nicotinic receptors at the neuromuscular junction and the cardiac muscarinic receptors .
C0018792
atria
C0018787
cardiac