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EKG Certification Exam study guide!!
EKG Certification Exam Study Guide 
Complete 2023 
Occurs when a patient has a very low potassium level Ans- U wave 
What complex occurs when th ventricles contract? Ans- QRS complex 
the heart has ___ valves? Ans- 4 
The two semilunar valves are? Ans- pulmonic and aortic valves 
Blood returning from the body to the hear enters the? Ans- right atrium 
The _____ vena cava gets it's blood from the head neck and upper extremities Ans- superior 
The _____ is the innermost layer of the heart Ans- en...