Final answer:
Beta-adrenergic blocking agents (ß-blockers) are used to treat angina pectoris by blocking ß-receptors to reduce vasoconstriction and lower heart rate, thereby improving cardiac function.
Step-by-step explanation:
Beta-adrenergic blocking agents, often referred to as ß-blockers, are commonly used to treat cardiovascular diseases, such as angina pectoris. These agents work by blocking the ß-receptors on the heart muscles that are associated with vasoconstriction and cardioacceleration. As a result, these drugs help in reducing blood pressure by preventing the binding of adrenaline and can improve cardiac function in patients with compromised cardiovascular systems. For instance, metoprolol is specific to the ß1-receptor, whereas propranolol blocks ß-receptors more generally. On the other hand, anticholinergics act on the parasympathetic nervous system and are not typically used to treat angina. Therefore, beta-adrenergic blocking agents are used to treat angina pectoris, making option 'a' the correct choice.
CORRECT QUESTION:
Beta adrenergic blocking agents or anticholinergics are used to treat:angina pectoris
a) Beta-adrenergic blocking agents b) Anticholinergics c) Both d) Neither