to elucidate the association of beta-adrenergic receptors with decreased myocardial catecholamine responsiveness in aging , we investigated the chronotropic response to isoproterenol and myocardial beta-adrenergic receptors in fisher 344 rats of 3 , 12 , and 24 months of age .
C0034785
beta-adrenergic receptors
C0248722
beta-adrenergic receptors