Block of which type of Monoamine Oxydase might be more selective for depression?

Correct Answer: A

Rationale: Rationale: MAO-A is more selective for depression because it primarily metabolizes serotonin and norepinephrine, neurotransmitters implicated in mood regulation. MAO-B mainly metabolizes dopamine. Choices B and C are incorrect because MAO-B is not as closely associated with depression, and MAO-C is a fictitious enzyme.

Correct Answer: C

Rationale: Rationale: Diazepam belongs to strong euphorizing agents due to its ability to produce feelings of euphoria and relaxation. It is a benzodiazepine with potent anxiolytic and sedative properties. Mebicarum (A) is an anxiolytic, not a strong euphorizer. Buspirone (B) is an anxiolytic without strong euphorizing effects. Chlordiazepoxide (D) is also a benzodiazepine but is not known for strong euphorizing properties.

Correct Answer: B

Rationale: The correct answer is B: Derivatives of Ipecacuanha and Thermopsis. These substances stimulate the reflex mechanism of coughing, leading to increased mucus clearance from the airways. Mucolytics like Ambroxol (choice D) thin out mucus, while sodium benzoate (choice A) is a preservative and trypsin (choice C) is an enzyme and not an expectorant. Therefore, B is correct as it directly promotes the cough reflex for mucus expulsion.

Correct Answer: B

Rationale: The correct answer is B: Cholenszyme. Cholenszyme is a digestive enzyme supplement and does not stimulate bile production or secretion. Chenodiol is a bile acid that promotes bile flow. Oxaphenamide is a choleretic agent that increases bile secretion. Cholosas contains bile salts and helps stimulate bile production. Therefore, Cholenszyme is the only option that does not directly stimulate bile production or secretion.

Correct Answer: C

Rationale: The correct answer is C because digoxin actually has a shorter half-life than digitoxin. Digoxin has a half-life of approximately 36 hours, while digitoxin has a longer half-life of around 7 days. A: Digoxin is a mild inotrope, which means it increases myocardial contractility. B: Digoxin increases vagal tone, leading to a decrease in heart rate. D: Digoxin acts by inhibiting the Na+/K+ ATPase pump, resulting in increased intracellular calcium levels and improved contractility. Therefore, choices A, B, and D are true statements regarding cardiac glycosides.