Antacids are weak bases that react with gastric hydrochloric acid to form salt and water. It’s

Correct Answer: A

Rationale: The correct answer is A: TRUE. Antacids, such as calcium carbonate or magnesium hydroxide, are weak bases that neutralize stomach acid (hydrochloric acid) by forming salt and water. This reaction helps to relieve symptoms of heartburn and indigestion. Option B is incorrect as antacids indeed react with gastric acid. Option C is incorrect as not all choices are correct, and Option D is incorrect as at least one of the choices is correct.

Correct Answer: B

Rationale: The correct answer is B: Verapamil. Verapamil is a calcium channel blocker that slows conduction through the AV node, making it effective in terminating supraventricular tachycardias. Nifedipine, choice A, is also a calcium channel blocker but is not typically used intravenously for this purpose. Choice C is incorrect because only Verapamil is specifically indicated for terminating supraventricular tachycardias. Choice D is incorrect as Verapamil is the correct drug for this scenario.

Correct Answer: D

Rationale: Step-by-step rationale: 1. Nifedipine is a calcium channel blocker that causes vasodilation. 2. Vasodilation leads to a decrease in blood pressure. 3. To compensate, the body may exhibit reflex tachycardia. 4. Therefore, nifedipine routinely produces tachycardia. Summary of incorrect choices: A. Propranolol is a beta-blocker that slows heart rate. B. Clonidine is a centrally-acting alpha-2 agonist that decreases sympathetic outflow, leading to bradycardia. C. Enalapril is an ACE inhibitor that does not directly affect heart rate.

Correct Answer: D

Rationale: The correct answer is D, the mammary gland. Prolactin is a hormone primarily responsible for mammary gland development and milk production in females. It stimulates the mammary alveolar cells to produce milk. The other choices, A: Liver, B: Adrenal cortex, and C: Thyroid, are not directly targeted by prolactin and do not have a primary role in milk production. Therefore, the correct answer is D as it directly correlates with the function of prolactin in the body.

Correct Answer: D

Rationale: The correct answer is D, All of the above. Glucagon, adrenal steroids, and adrenaline are important hormonal antagonists of insulin. Glucagon promotes glucose release from the liver, counteracting insulin's effects. Adrenal steroids and adrenaline increase blood sugar levels by promoting gluconeogenesis and glycogenolysis. Therefore, all these agents act against insulin to regulate blood glucose levels. Other choices are incorrect because each agent individually plays a role in antagonizing insulin's effects.