the in vitro chronotropic and inotropic effects of vasoactive intestinal peptide ( vip ) and of isoproterenol , two agents known to stimulate cardiac adenylate cyclase were compared on the heart from cynomolgus monkey using the spontaneously beating right atrium , the electrically stimulated left atrium , and the electrically-stimulated ventricular papillary muscle .
C0018787
heart
C0018827
ventricular