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Vasoconstriction in arteries occurs when smooth muscle contracts in which layer?
AThe lumen itself
BThe tunica media
CThe tunica intima
DThe tunica externa
Answer & Solution
Correct answer: B. The tunica media
1. Vessel walls are built in named layers.
2. Vasoconstriction involves smooth muscle in the vessel wall.
3. That smooth muscle sits in a specific layer.
4. It is the smooth muscle in the walls of the tunica media that contracts.
5. Contraction narrows the lumen and raises 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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