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Ch. 14 The Autonomous Nervous System and Homeostasis
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All textbooksErin C. Amerman 2nd EditionCh. 14 The Autonomous Nervous System and HomeostasisProblem 14.2a

Chapter 14, Problem 14.2a

A patient, Dr. Young, has both asthma and high blood pressure. Her physician prescribed the drug propranolol to treat her hypertension; this drug blocks all types of β-adrenergic receptors. She also takes the drug albuterol for asthma, which activates β2 receptors on bronchial smooth muscle. Will the pairing of these two drugs cause problems for Dr. Young? Explain.

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Hey, everyone. Let's take a look at this question together. The drug propranolol is usually taken for hypertension but could also be taken for stage fright, which of the following would be the expected result of taking propranolol. Is it answer choice? A inhibition of both beta one and beta two adrenergic receptors. Answer choice B stimulation of both beta one and beta two adrenergic receptors. Answer choice c inhibition of muscarinic receptors or answer choice d stimulation of nicotinic receptors. Let's work this problem out together to try to figure out which of the following answer choices best explains the result of taking the drug propranolol. So, in order to solve this question, we have to recall what we have learned about the drug propranolol and its effect on the body to determine which of the following answer choices would be the expected result from taking propranolol. And we can recall that propranolol is a nonselective beta adrenergic blocker. And the term nonselective when talking about propranolol means that Propranolol is a competitive antagonist at both beta one and beta two adrenergic receptors. And since propranolol is a competitive antagonist at both receptors, taking propranolol results in a decreased heart rate, decreased myocardial contractility, decreased blood pressure and decreased myocardial oxygen demand. Which best explains why the drug propranolol is usually taken for hypertension but could also be taken for stage. Fright. So looking at our answer choices, which of the following is that expected result of taking propranolol, which is a nonselective beta adrenergic blocker. And we can identify answer choice. A as the correct answer. Since propranolol being a nonselective beta adrenergic blocker, it would result in inhibition of both beta one and beta two adrenergic receptors. So answer choice A is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.
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