Du, X.Y.

atrial effect tissue receptor inotropic response 5- ht inotropic effect heart force noradrenaline trabeculae acetylcholine histamine inotropic effects contraction atrial tissue porcine ventricle atrium contractile contractility muscarinic baseline concentration increase study right myocardium curve figure substance contractile force baseline contractile force result atrial trabeculae inotropic response chapter schoemaker adenosine cyclase angiotensin ii species function muscle difference somatostatin saxena angiotensin muscarinic m calcitonin gene-related peptide antagonist value adenylyl panel mechanism adenylyl cyclase system presence concentration-response curve stimulation atria subtype peptide pharmacol protein preparation agonist pirenzepine baseline force experiment channel pharmacology contrast mcn-a atrial contractility agent inotropic responses baseline values biogenic substances