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Which receptor is blocked when propranolol

is administered to reduce cardiac output?
(A) α₁ receptors
(B) β₁ receptors
(C) β₂ receptors
(D) Muscarinic receptors
(E) Nicotinic receptors

User Ashawn
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1 Answer

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Final answer:

Propranolol is a β-blocker that reduces cardiac output by blocking β₁ receptors, preventing epinephrine and norepinephrine from increasing heart rate, thus treating hypertension.

Step-by-step explanation:

When propranolol is administered to reduce cardiac output, it blocks the β₁ receptors (B) on the heart muscle. Propranolol is a type of β-blocker, which is a class of medications known to block β-adrenergic receptors. These receptors are associated with various cardiovascular functions, such as vasoconstriction and cardioacceleration.

By blocking β₁ receptors, propranolol prevents norepinephrine (NE) and epinephrine from binding to these receptors, which leads to a reduction in heart rate (HR) and cardiac output, making it an effective treatment for hypertension. Overprescription of β-blockers can, however, lead to side effects such as bradycardia and even stoppage of the heart.

User Mybirthname
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