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Chapter 9: Problem 12

A drug that serves as an agonist for \(\alpha_{2}\) receptors can be used to a. increase the heart rate. b. decrease the heart rate. c. dilate the bronchioles. d. constrict the bronchioles. e. constrict the blood vessels.

Short Answer

Expert verified
A drug that serves as an agonist for 伪鈧� receptors can be used to constrict the blood vessels. This is because activation of 伪鈧� receptors leads to constriction of blood vessels, and an agonist will promote their activity.

Step by step solution

01

伪鈧� receptors are a type of adrenergic receptor found in various tissues throughout the body. They play a role in mediating various physiological functions, such as the regulation of heart rate, bronchial smooth muscle tone, and blood vessel constriction. Activation of 伪鈧� receptors typically leads to a decrease in heart rate, constriction of blood vessels, and dilation of bronchioles. #Step 2: Identifying the Effect of an Agonist#

An agonist is a substance that binds to and activates a receptor, stimulating the receptor's function. In this case, the drug is an agonist for 伪鈧� receptors, meaning it will activate these receptors and promote their effects on the various physiological functions mentioned above. #Step 3: Evaluating the Options#
02

Now that we understand the functions of 伪鈧� receptors and the effect of an agonist, let's analyze the given options: a. Increase the heart rate. Since activating 伪鈧� receptors leads to a decrease in heart rate, an agonist of 伪鈧� receptors will not increase the heart rate. b. Decrease the heart rate. An agonist for 伪鈧� receptors will promote their activity, leading to a decrease in heart rate. c. Dilate the bronchioles. Activation of 伪鈧� receptors typically results in the dilation of bronchioles. However, this is not the main effect of 伪鈧� receptors in the respiratory system when compared to their effect on blood vessels. d. Constrict the bronchioles. An agonist for 伪鈧� receptors will not constrict the bronchioles, as their activation dilates the bronchioles. e. Constrict the blood vessels. As activation of 伪鈧� receptors leads to constriction of blood vessels, an agonist for 伪鈧� receptors will constrict the blood vessels. #Step 4: Selecting the Correct Option#

Based on our analysis of the 伪鈧� receptor functions and the effect of an agonist, the correct option is: e. Constrict the blood vessels.

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