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 B
Explanation
Choice A rationale: Diphenhydramine blocks the action of histamine by binding to H1 receptors, rather than preventing its release from mast cells.
Choice B rationale: Diphenhydramine works by blocking the activation of histamine receptors, preventing the effects of histamine.
Choice C rationale: Diphenhydramine is not involved in preventing axonal conduction.
Choice D rationale: Diphenhydramine is an H1 receptor antagonist and does not promote receptor activation.
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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