The structure between the uterus and the vagina is the

Correct Answer: B

Rationale: The correct answer is B: cervix. The cervix is the structure between the uterus and the vagina. It functions as a passageway for sperm to travel to the uterus and for menstrual blood to flow out of the uterus. The other choices are incorrect because: A: Uterine tube (fallopian tube) connects the ovary to the uterus, not between the uterus and vagina. C: Vulva refers to the external genitalia, not the internal structure between the uterus and vagina. D: Hymen is a thin membrane at the vaginal opening, not the structure between the uterus and vagina.

Correct Answer: D

Rationale: The correct answer is D: On-Off phenomenon. Levodopa is a medication used to treat Parkinson's disease by increasing dopamine levels in the brain. The On-Off phenomenon refers to the fluctuation between periods of good symptom control (On) and poor symptom control (Off) experienced by some patients taking levodopa. Tremor (choice A) is a symptom of Parkinson's but not directly caused by levodopa. Spasticity (choice B) is not typically associated with levodopa use. Akinesia (choice C) is a symptom of Parkinson's but not a direct effect of levodopa. Therefore, the correct answer is D due to levodopa's potential to cause the On-Off phenomenon in Parkinson's disease treatment.

Correct Answer: C

Rationale: The correct answer is C: Diarrhoea. Morphine is known to cause constipation, not diarrhoea. Morphine binds to opioid receptors in the gut, reducing peristalsis and causing constipation. Analgesia and sedation are known effects of morphine due to its action on the central nervous system. Morphine is also known to increase prolactin secretion by acting on the hypothalamus. Therefore, the correct answer is C, as morphine does not typically cause diarrhoea.

Correct Answer: C

Rationale: The correct answer is C: Olanzapine. Olanzapine is an atypical antipsychotic medication, not an SSRI. SSRIs (Selective Serotonin Reuptake Inhibitors) are a class of antidepressants that specifically target serotonin reuptake. Fluvoxetine, Paroxetine, and Fluvoxamine are all SSRIs used to treat depression and anxiety disorders. Olanzapine, on the other hand, is primarily used to treat schizophrenia and bipolar disorder by targeting dopamine and serotonin receptors. Therefore, C is the correct answer as it does not belong to the class of selective SSRIs.

Correct Answer: C

Rationale: The correct answer is C: PAF. Platelet-activating factor (PAF) is the most potent agent increasing capillary permeability due to its ability to induce endothelial cell contraction and disruption of tight junctions. PAF also activates mast cells to release histamine, further enhancing vascular permeability. LTD4 can also increase capillary permeability but is less potent than PAF. PGD2 and TXA2 do not directly increase capillary permeability.