How do beta-adrenergic blocking agents reduce myocardial oxygen demand?
a. By inhibiting the stimulation of norepinephrine and epinephrine
b. By increasing the production of dopamine and acetylcholine
c. By delaying the destruction of acetylcholinesterase and cholinesterase
d. By enhancing the sensitivity of alpha receptors and beta receptors
ANS: A
Beta-adrenergic blocking agents prevent the stimulation of epinephrine and norepinephrine, which normally increase heart rate. Dopamine and acetylcholine are not beta-adrenergic neurotransmitters. Beta blockers do not delay the destruction of these enzymes. Beta blockers do not enhance the sensitivity of alpha adrenergic and beta receptor sites.
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