PCCN Exam 1 with Questions and Answers

PCCN Exam 1 with Questions and Answers There are _____ layer of the heart. A. 6 layers B. 5 layers C. 4 layers D. 3 layers ANSWER B. 5 layers The 5 layers of the heart from the outside in are the pericardium, epicardium, myocardium, endocardium and the cardiac skeleton. Mr. Key has a regular heart rate of 80 beats per minute. The pacemaker of the heart is likely the: A. AV node B. Bundle of HIS C. endocardium D. SA node ANSWER D. SA node The SA node generates impulses of 60-100 bpm. The AV node generates impulses of 40-60 bpm. The HIS bundle and Purkinje system generates impulses of 20-40 bpm. The endocardium supports blood flow, not conduction On Mr. Key's ECG, the T wave represents: A. Atrial depolarization B. Atrial repolarization C. Ventricular depolarization