Question

Propranolol is a beta blocker. It would therefore cause a. vasodilation. b. slowing of the heart rate. c. increased blood pressure. d. secretion of saliva.

Short answer

Propranolol, as a beta blocker, would cause \(b.\) slowing of the heart rate.

Step-by-step solution

Understanding Beta Blockers

Beta blockers are a class of medications that work by blocking the effects of the hormone epinephrine (also called adrenaline). They help to reduce the workload on the heart and lower blood pressure. They are often prescribed for conditions such as hypertension, high blood pressure, and arrhythmias.

Evaluate Option A

Option A states that propranolol would cause vasodilation. Vasodilation refers to the dilatation of blood vessels, which decreases blood pressure. Since beta blockers help to lower blood pressure, it could be inferred that they may cause vasodilation. However, they do not directly cause vasodilation, but rather work by reducing the heart rate and contractility. Therefore, option A is incorrect.

Evaluate Option B

Option B states that propranolol would cause the slowing of the heart rate. As we know, beta blockers work by blocking the effects of epinephrine, which helps to reduce the workload on the heart. This, in turn, reduces the heart rate, making option B the correct choice.

Evaluate Option C

Option C suggests that propranolol would cause an increase in blood pressure. Since beta blockers work to lower blood pressure and reduce the workload on the heart, this option is incorrect.

Evaluate Option D

Option D states that propranolol would cause the secretion of saliva. This option is not related to the effects of a beta blocker and is therefore incorrect. Based on our evaluation of each option, we can conclude that: Propranolol, as a beta blocker, would cause \(b.\) slowing of the heart rate.