Correct Answer: A

Rationale: Serotonin is a substance found in the body that promotes sleep. It plays a role in the synthesis of a hypnogenic factor that directly induces sleep. Cortisol is a stress hormone that can disrupt sleep patterns. Alcohol can disrupt REM sleep and negatively impact sleep quality. Narcotics, like alcohol, can interfere with sleep architecture and lead to poor quality sleep. Therefore, the correct answer is serotonin as it is associated with promoting sleep, while the other substances listed can have negative effects on sleep patterns.

Correct Answer: B

Rationale: High HDL cholesterol is associated with a decreased risk of cardiovascular disease because HDL cholesterol is known as 'good' cholesterol. It helps remove other forms of cholesterol, like LDL cholesterol, from the bloodstream, reducing the risk of plaque buildup in the arteries. Low HDL cholesterol (Choice B) is actually a risk factor for cardiovascular disease because it means there is less of the 'good' cholesterol to perform its protective functions. Low total cholesterol (Choice C) and low triglycerides (Choice D) are not necessarily associated with a decreased risk of cardiovascular disease, as the balance and types of cholesterol play a more crucial role in heart health.

Correct Answer: A

Rationale: The correct initial action upon discovering an electrical fire is to disconnect the electrical power if it can be done safely. This helps prevent the fire from spreading through the electrical system. Smothering the fire with a blanket is not recommended for electrical fires as it can fuel the fire. Saturating the source with water or other liquids is also not advised as it can lead to electric shock or spread the fire. Activating the fire alarm is important, but it should be done after disconnecting the power to prevent further escalation of the fire.

Correct Answer: C

Rationale: No metal objects may be worn while receiving magnetic resonance imaging due to safety risks involved with the strong magnet. The correct response by the nurse should prioritize the safety of the client. Allowing the client to wear the metal crucifix poses a risk of injury or interference with the imaging process. Option A is not appropriate as safety takes precedence over comfort in this situation. Option B is incorrect as it does not address the safety concerns associated with wearing metal objects during an MRI. Option D is also incorrect as it fails to acknowledge the safety issue involved and instead focuses solely on the importance to the client. It is important for the nurse to offer alternative forms of spiritual support that do not pose a risk during the MRI procedure.

Correct Answer: B

Rationale: The first action the nurse should take is to report the finding to the nursing supervisor and follow the chain of command. Notifying the nursing supervisor allows for immediate action within the facility to address the discrepancy. If it is found that the pharmacy is in error, then notifying the hospital pharmacist (Choice A) would be appropriate. Choices C and D, notifying the Board of Nursing and the director of nursing, are not the initial steps to take. These options may be necessary if theft is suspected or if the facility's internal response is inadequate. Therefore, they are incorrect answers.