Textbook Question
Central nervous system control over the ANS is mediated by:
a. The reticular formation
b. The hypothalamus
c. The thalamus
d. Both a and b
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14. The Autonomic Nervous System
Introduction to the Autonomic Nervous System
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Which of the following would cause vasodilation of arterioles in the autonomic nervous system?
A
Activation of the parasympathetic nervous system
B
Release of acetylcholine
C
Release of norepinephrine
D
Activation of the sympathetic nervous system
Verified step by step guidance1
Understand the role of the autonomic nervous system, which is divided into the sympathetic and parasympathetic systems, in regulating blood vessel diameter.
Recognize that the parasympathetic nervous system is generally associated with 'rest and digest' functions, promoting relaxation and vasodilation in certain contexts.
Identify that acetylcholine is a neurotransmitter released by the parasympathetic nervous system, which can lead to vasodilation by acting on muscarinic receptors in the blood vessels.
Understand that the sympathetic nervous system typically causes vasoconstriction through the release of norepinephrine, which acts on alpha-adrenergic receptors.
Conclude that activation of the parasympathetic nervous system and the release of acetylcholine are associated with vasodilation of arterioles, while the sympathetic nervous system and norepinephrine are linked to vasoconstriction.
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