NBME CBSE MCQs Mastery: Ace Your USMLE step 1
This comprehensive study resource is designed to equip medical students with the knowledge and skills necessary to excel on the USMLE Step 1 examination. Featuring a vast collection of multiple-choice questions (MCQs) meticulously crafted to mirror t...
Drug Mechanisms of Action
Questions
* Which of the following drugs acts by blocking the renin-angiotensin-aldosterone system
(RAAS)?
* A. Lisinopril
* B. Amlodipine
* C. Metoprolol
* D. Hydrochlorothiazide
* The mechanism of action of statin drugs involves:
* A. Increasing LDL cholesterol levels
* B. Inhibiting HMG-CoA reductase
* C. Stimulating bile acid synthesis
* D. Blocking cholesterol absorption
* Antihistamines primarily work by:
* A. Stimulating histamine release
* B. Blocking histamine receptors
* C. Increasing the production of histamine
* D. Enhancing the effects of histamine
* The mechanism of action of proton pump inhibitors (PPIs) involves:
* A. Increasing gastric acid secretion
* B. Blocking histamine receptors in the stomach
* C. Stimulating mucus production
* D. Inhibiting the final step of gastric acid production
* Corticosteroids exert their anti-inflammatory effects by:
* A. Stimulating the immune system
* B. Inhibiting phospholipase A2
* C. Increasing cytokine production
* D. Promoting histamine release
* The mechanism of action of insulin involves:
* A. Stimulating glycogenolysis
* B. Promoting gluconeogenesis
* C. Increasing glucose uptake by cells
* D. Inhibiting insulin receptor tyrosine kinase
* Beta-2 agonists primarily cause:
* A. Bronchoconstriction
* B. Bronchodilation
* C. Increased mucus production
* D. Decreased respiratory rate
* The mechanism of action of leukotriene receptor antagonists involves:
* A. Stimulating leukotriene production
* B. Blocking leukotriene receptors
, * C. Increasing histamine release
* D. Inhibiting phospholipase A2
* The primary mechanism of action of warfarin is:
* A. Inhibiting platelet aggregation
* B. Inhibiting vitamin K-dependent clotting factors
* C. Directly dissolving blood clots
* D. Increasing fibrinolysis
* Selective serotonin reuptake inhibitors (SSRIs) primarily:
* A. Increase serotonin levels in the brain
* B. Decrease serotonin levels in the brain
* C. Block dopamine receptors
* D. Stimulate norepinephrine release
* The mechanism of action of benzodiazepines involves:
* A. Enhancing GABA receptor activity
* B. Inhibiting GABA receptor activity
* C. Stimulating glutamate receptors
* D. Blocking acetylcholine receptors
* Opioid analgesics produce pain relief primarily by:
* A. Stimulating pain receptors
* B. Blocking pain receptors
* C. Increasing inflammation
* D. Decreasing blood flow to the pain site
* The mechanism of action of nonsteroidal anti-inflammatory drugs (NSAIDs) involves:
* A. Inhibiting cyclooxygenase (COX) enzymes
* B. Stimulating prostaglandin synthesis
* C. Increasing leukotriene production
* D. Blocking histamine receptors
* The primary mechanism of action of diuretic drugs is to:
* A. Increase blood pressure
* B. Increase fluid retention
* C. Promote diuresis (increased urine output)
* D. Decrease renal blood flow
* Angiotensin-converting enzyme (ACE) inhibitors lower blood pressure by:
* A. Increasing angiotensin II levels
* B. Blocking the conversion of angiotensin I to angiotensin II
* C. Stimulating aldosterone release
* D. Increasing sodium and water retention
* Calcium channel blockers primarily:
* A. Increase heart rate
* B. Decrease blood pressure
* C. Stimulate the sympathetic nervous system
* D. Increase cardiac contractility
* The mechanism of action of digoxin involves:
* A. Increasing heart rate
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