atropine ( 10 ( -7 ) m ) did not affect the resting heart rate of age-matched controls or diabetics but blocked methacholine ( 2.6 x 10 ( -6 ) m ) -induced bradycardia in both , suggesting that the site of action of diabetic bradycardia is not the muscarinic receptors .
C0004259
atropine
C0428977
bradycardia