Multiple Choice
Which of the following is a function of the somatic nervous system?
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14. The Autonomic Nervous System
Introduction to the Autonomic Nervous System
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Which of the following is not a vasoconstrictor?
A
Epinephrine
B
Angiotensin II
C
Histamine
D
Vasopressin
Verified step by step guidance1
Understand the concept of vasoconstriction: Vasoconstriction is the narrowing of blood vessels resulting from contraction of the muscular wall of the vessels, particularly the large arteries and small arterioles.
Identify the role of each substance listed: Epinephrine, Angiotensin II, and Vasopressin are known to cause vasoconstriction, which increases blood pressure by narrowing the blood vessels.
Learn about Histamine: Histamine is a compound involved in local immune responses. It is known for causing vasodilation, which is the widening of blood vessels, leading to a decrease in blood pressure.
Compare the effects: While Epinephrine, Angiotensin II, and Vasopressin are vasoconstrictors, Histamine acts as a vasodilator, which is the opposite effect.
Conclude the analysis: Based on the understanding of these substances, Histamine is not a vasoconstrictor, as it causes vasodilation instead.
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