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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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