Which neurotransmitter is active in both the peripheral and central nervous system (CNS)?
Norepinephrine
Serotonin
Substance P
Dynorphins
The Correct Answer is A
Choice A rationale: Norepinephrine is a neurotransmitter that is active in both the peripheral and central nervous systems.
Choice B rationale: Serotonin is primarily active in the central nervous system.
Choice C rationale: Substance P is a neurotransmitter that functions more in the peripheral nervous system.
Choice D rationale: Dynorphins primarily function in the central nervous system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale: Patient-controlled analgesia (PCA) devices provide a controlled dose of medication when the patient presses the button. However, the onset of action for morphine is typically faster than 10 minutes.
Choice B rationale: PCA devices often have a lock-out period to prevent patients from administering too many doses too quickly and risking overdose.
Choice C rationale: Patient-controlled analgesia is designed for the patient to self- administer the medication. Allowing family members to press the button may lead to inaccurate dosing.
Choice D rationale: Morphine should be administered as needed, not preemptively.
Administering the medication 10 minutes before physical therapy could result in excessive sedation.
Correct Answer is B
Explanation
Choice A rationale: While methotrexate can help prevent fatal toxicities associated with rheumatoid arthritis, this is not the primary reason for its use in this context.
Choice B rationale: This is correct. Starting methotrexate early in the course of rheumatoid arthritis can help delay the disease process of joint degeneration and prevent irreversible damage.
Choice C rationale: While controlling symptoms is important for the patient's quality of life, starting methotrexate is more about preventing joint damage and progression of the disease than increasing life expectancy.
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