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Heart valves exist to make blood flow through the heart in a way that is:

AUninterrupted
BUncoordinated
CUnidirectional
DUnconditional
Answer & Solution
Correct answer: C. Unidirectional
1. Pressure changes would otherwise push blood backwards. 2. The valves close against that backflow. 3. So flow stays unidirectional. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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