Tick the positive inotropic drug of glycoside structure:

Correct Answer: B

Rationale: Step-by-step rationale: 1. Digoxin is a positive inotropic drug of glycoside structure. 2. Digoxin works by inhibiting the sodium-potassium pump, leading to increased intracellular calcium levels, enhancing myocardial contractility. 3. Dopamine is a catecholamine used for its positive inotropic effects but does not have a glycoside structure. 4. Dobutamine is a synthetic catecholamine with positive inotropic effects but lacks a glycoside structure. 5. Adrenaline is a catecholamine with positive inotropic effects, but it is not a glycoside structure. Summary: Digoxin is the correct answer because it has a glycoside structure and exerts positive inotropic effects by increasing intracellular calcium levels. Dopamine, dobutamine, and adrenaline are not glycoside drugs and work through different mechanisms.

Correct Answer: A

Rationale: The correct answer is A: Antiprogestin. Mifepristone is a synthetic steroid that acts as an antiprogestin by competitively binding to progesterone receptors, blocking the effects of progesterone. It is commonly used for medical abortion and in the treatment of conditions like Cushing's syndrome. Explanation for incorrect choices: B: Antiandrogen - Mifepristone does have some antiandrogenic properties, but its primary mechanism of action is as an antiprogestin. C: Antiestrogen - Mifepristone is not an antiestrogen; it does not block estrogen receptors. D: Androgen - Mifepristone is not an androgen; it is a synthetic steroid with antiprogestational activity.

Correct Answer: A

Rationale: The correct answer is A. Allergic reaction is a response of the immune system to an allergen that the body has previously been sensitized to. This response can be local or generalized, involving various symptoms such as itching, hives, swelling, and in severe cases, anaphylaxis. Choice B describes inflammation, not specifically related to allergies. Choices C and D are unrelated medications. In summary, choice A is correct because it accurately defines an allergic reaction, while the other choices do not specifically address the nature of allergies.

Correct Answer: A

Rationale: The correct answer is A because vitamin-like compounds are a group of compounds that are essential for health but are not classified as vitamins. These compounds have specific roles in the body, particularly during periods of rapid growth and development. They are not inorganic nutrients (B) or organic substances needed in large quantities (C). They are also not products of endocrine gland secretion (D). The key is to understand that vitamin-like compounds are essential for certain stages of development and growth, making choice A the most appropriate answer.

Correct Answer: B

Rationale: Selegiline is the correct answer as it is a monoamine oxidase (MAO) inhibitor. MAO inhibitors block the breakdown of monoamine neurotransmitters such as dopamine, serotonin, and norepinephrine. Physostigmine is an acetylcholinesterase inhibitor, not an MAO inhibitor. Acetazolamide is a carbonic anhydrase inhibitor used in glaucoma and altitude sickness. Disulfiram is an aldehyde dehydrogenase inhibitor used in alcohol aversion therapy.