![]() When access to beta-receptor sites is blocked by propranolol, the chronotropic, inotropic, and vasodilator responses to beta-adrenergic stimulation are decreased proportionately. It specifically competes with beta-adrenergic receptor-stimulating agents for available receptor sites. Propranolol is a nonselective, beta-adrenergic receptor-blocking agent possessing no other autonomic nervous system activity.
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