Concerning Alpha blockers, which of the following is CORRECT:

Questions 56

ATI RN

ATI RN Test Bank

Endocrine System Exam Questions Answers Questions

Question 1 of 5

Concerning Alpha blockers, which of the following is CORRECT:

Correct Answer: C

Rationale: Rationale: C: Prazosin can block Alpha1 receptor only. - Prazosin is a selective Alpha1 blocker, mainly used for hypertension. - By blocking Alpha1 receptors, it reduces vasoconstriction and lowers blood pressure. - Prazosin does not affect Alpha2 receptors, distinguishing it from non-selective Alpha blockers. - Correct as it accurately describes Prazosin's mechanism of action. Incorrect: A: Phentolamine is a non-selective Alpha blocker, affecting both Alpha1 and Alpha2 receptors. B: Alpha2 blockers increase noradrenaline release by inhibiting the negative feedback control. D: Alpha blockers typically decrease blood pressure, but can increase heart rate due to vasodilation.

Question 2 of 5

Pilocarpine is used in the treatment of:

Correct Answer: D

Rationale: Pilocarpine is a parasympathomimetic agent that stimulates the muscarinic receptors in the eye, causing pupillary constriction and reducing intraocular pressure. This mechanism of action makes it effective in treating glaucoma. Heart failure (A), bronchial asthma (B), and urinary obstruction (C) are not indications for pilocarpine use based on its pharmacological properties and effects.

Question 3 of 5

If farmers exposed to 'insecticides' ('irreversible' cholinesterase inhibitors) are given medical kits that contain atropine. Which one of the following effects of the cholinesterase inhibitor will NOT be blocked by the atropine?

Correct Answer: D

Rationale: The correct answer is D. Atropine blocks the effects of cholinesterase inhibitors on muscarinic receptors but not on nicotinic receptors, which are responsible for skeletal muscle overstimulation. Atropine can block bronchoconstriction, increased bladder activity, and increased bowel motility as they are mediated by muscarinic receptors. Therefore, the effects on skeletal muscle overstimulation, leading to paralysis, will not be blocked by atropine.

Question 4 of 5

Which one of the following properties makes labetalol different from nearly all the other β-blockers on the market?

Correct Answer: A

Rationale: The correct answer is A because labetalol is unique among most β-blockers as it also blocks alpha-adrenergic receptors. This dual action results in vasodilation and reduced blood pressure. Choice B is incorrect as labetalol does not cause atropine-like side effects. Choice C is incorrect as labetalol blocks both β1 and β2 receptors. Choice D is also incorrect as labetalol does have some β2 blocking activity, making it not entirely safe for asthmatics.

Question 5 of 5

Which sentences are correct?

Correct Answer: B

Rationale: The correct answer is B: 1 and 2 only. Sentence 1 and 2 are correct because they are grammatically accurate and logically coherent. Sentence 3 is incorrect as it contains a grammatical error. The key is to analyze each sentence independently to determine its correctness based on grammar, clarity, and logical consistency. In this case, only sentences 1 and 2 meet the criteria, making B the correct choice.

Access More Questions!

ATI RN Basic


$89/ 30 days

ATI RN Premium


$150/ 90 days

Similar Questions