NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Study for the NAPLEX exam with a comprehensive quiz featuring multiple-choice questions and in-depth explanations. Build your pharmacological knowledge and increase your chances of passing the pharmacist licensure examination!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which of the following is NOT an effect of dopamine depending on the dose?

DA-1 agonist
B-1 agonist
A-2 agonist
A-1 agonist

The correct answer is: A-2 agonist

Dopamine has different effects on the body depending on the dose and its interaction with various receptors. At low doses, dopamine primarily acts on DA-1 receptors, leading to vasodilation in the renal, mesenteric, and coronary beds. This effect is known as a DA-1 agonist effect. At moderate doses, dopamine stimulates B-1 receptors, resulting in increased heart rate and contractility. This is the B-1 agonist effect of dopamine. At high doses, dopamine can stimulate A-1 receptors, causing vasoconstriction in the systemic vasculature. The A-2 agonist effect is not one of the typical effects of dopamine based on dose and receptor interaction.