Use This Information to Respond to the Following Questions

question 38

Multiple Choice

Use this information to respond to the following questions.
Humans have receptors for two kinds of beta adrenergic compounds such as catecholamines to control cardiac muscle contractions. Some are beta 1 receptors that promote increased heart rate. Other drugs, called beta blockers, slow heart rate. Smooth muscle cells, however, have beta 2 receptors, which mediate muscle relaxation. Blockers of these effects are sometimes used to treat asthma.
-The use of beta 2 antagonist drugs may be useful in asthma because they may

• A) increase constriction of the skeletal muscle of the chest wall.
• B) increase heart rate and therefore allow the patient to get more oxygen circulated.
• C) dilate the bronchioles by relaxing their smooth muscle.
• D) override the beta blockers that the patient is already taking.
• E) obstruct all G protein-mediated receptors.

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