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.
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Related Questions
Correct Answer is B
Explanation
Choice A rationale: Epinephrine does increase the speed of conduction, but it does not significantly contribute to gluconeogenesis.
Choice B rationale: Epinephrine is used in cardiac arrest to increase heart rate, contractility, and conduction. In asthma, it causes bronchodilation.
Choice C rationale: While epinephrine can cause some vasodilation, it is not a primary indication for its use in cardiac arrest or status asthmaticus.
Choice D rationale: Epinephrine causes bronchodilation, not bronchoconstriction.
Correct Answer is B
Explanation
Choice A rationale: Atropine is not primarily used to prevent anxiety. Its main use is to increase heart rate by blocking vagal effects on the heart.
Choice B rationale: Atropine is commonly used to prevent or treat bradycardia, particularly during anesthesia induction, when vagal stimulation can lead to significant slowing of the heart rate.
Choice C rationale: Dry mouth is a common side effect of atropine, not its primary use. Atropine is not given to prevent dry mouth.
Choice D rationale: Atropine is not used to prevent hypertension. Its primary cardiovascular effect is to increase heart rate.
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