Therapeutic doses of the opioid analgesics:

Correct Answer: D

Rationale: The correct answer is D: Therapeutic doses of opioid analgesics do not affect body temperature. Opioid analgesics primarily act on the central nervous system to provide pain relief, without directly impacting body temperature regulation. Choices A and B are incorrect as opioid analgesics do not have a significant impact on altering body temperature. Choice C is incorrect as opioid analgesics do not affect body heat loss mechanisms. Thus, the correct answer is D because opioid analgesics do not have a direct effect on body temperature regulation.

Correct Answer: D

Rationale: The correct answer is D because depression is a complex condition involving various neurotransmitters. Dopamine, serotonin, and acetylcholine play key roles in regulating mood and emotions. Dysfunction in any of these synapses can contribute to depressive symptoms. Therefore, all the options (A, B, and C) are involved in depression. Dopaminergic synapses are linked to motivation and pleasure, serotoninergic synapses are associated with mood regulation, and cholinergic synapses are involved in cognitive function and memory. Therefore, it is crucial to consider the interplay of all these neurotransmitters in understanding and treating depression.

Correct Answer: D

Rationale: The correct answer is D because Cordiamine, also known as Nikethamide, is a respiratory and circulatory stimulant. It is used to treat hypotension by increasing blood pressure, coronary insufficiency by improving blood flow to the heart, and respiratory insufficiency by stimulating breathing. Therefore, it is effective in treating all the conditions mentioned in choices A, B, and C. Choices A, B, and C are incorrect because Cordiamine does not specifically target only one of these conditions; rather, it addresses all of them due to its dual stimulant action on both the circulatory and respiratory systems.

Correct Answer: D

Rationale: The correct answer is D because barbiturate abstinent syndrome can manifest as a variety of symptoms including crisis by 3 days of abstention, anxiety, mydriasis, myasthenia, muscular convulsions, vomiting, diarrhea, and psychosis as delirium with color visual and auditory hallucinations. Each of the other choices (A, B, C) only represents a subset of the symptoms associated with barbiturate abstinent syndrome, while choice D encompasses all possible manifestations, making it the correct and comprehensive answer.

Correct Answer: A

Rationale: The correct answer is A: Libexine. Non-narcotic antitussives, such as Libexine, do not contain opioids or narcotics, making them safer for use without the risk of dependence or addiction. Libexine works by suppressing the cough reflex in the brainstem without causing sedation or respiratory depression. Choice B, Tusuprex, is incorrect as it contains codeine, which is a narcotic antitussive. Choice C, Codeine, is also incorrect as it is a narcotic antitussive that acts on the central nervous system to suppress cough reflex. Choice D, Aethylmorphine hydrochloride, is incorrect as it is a semi-synthetic opioid derivative, making it a narcotic antitussive.