alleryStart learning →In arteries, vasoconstriction makes the lumen narrower and has what effect on blood flow?
AIt decreases
BIt increases
CIt is unchanged
DIt reverses
Answer & Solution
Correct answer: A. It decreases
1. Narrowing the passage restricts what passes through it.
2. Vasoconstriction occurs when smooth muscle in the tunica media contracts.
3. Specifically in arteries, vasoconstriction decreases blood flow.
4. The contraction makes the lumen narrower.
5. It also increases blood pressure.
_Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 20 'The Cardiovascular System: Blood Vessels and Circulation', sections 20.1-20.5_
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