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The hollow passageway through which blood flows in a vessel is called the:
ALumen
BTunica
CValve
DNode
Answer & Solution
Correct answer: A. Lumen
1. Every vessel type shares one structural feature.
2. Vessels differ in wall thickness and diameter.
3. Each type of vessel has a lumen.
4. That is a hollow passageway through which blood flows.
_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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