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._
Keep practising Heart Anatomy
Browse all Heart Anatomy questions for NREMT AEMT, or explore more Biology topics.