competition curves with selective beta 1- and beta 2-adrenergic receptor agonists and antagonists again demonstrated a pattern for coronary artery intermediate to that of heart and lung , further confirming the presence of both beta-adrenergic receptor subtypes in large coronary arteries , with a ratio of beta 1 : beta 2 of 1.5-2.0:1.0 .
C0205042
coronary artery
C0018787
heart