Learn more about the heart’s 4 valves, where they lie and how they work. This is a necessary topic in comprehending heart anatomy and physiology!
http://phlebotomycareertraining.org/phlebotomy-lesson-3-1-heart-valves/https://phlebotomycareertraining.org/nope-phlebotomist-education-training-tutorial-school-labassistant-phlebotomy/
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