Sharp EKG Study Guide Questions With Correct Answers.
- layers of the heart Answer- pericardium, myocardium, endocardium
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Pericardium Answer- Primary function to provide lubrication, preventing friction as the heart beats Myocardium Answer- -responsible for the hearts ability to contract -thick muscle layer Myocardium Answer- Chamber thickness is related to the amount of resistance the muscle must overcome to pulp blood out of the chamber endocardium Answer- -smooth, thin layer of tissue that lines the heart chambers & valvues -Allows blood to flow easily thru the heart Two types of cardiac cells Answer- pacemaker cells and myocardial cells 1st degree HB Answer- Prolonged PR interval 2nd degree type 1 - wenkcbach - mobitz II Answer- PR interval gets longer... going going gone.2nd degree type 2 AV Block or mobitz II Answer- Dropped QRS.. PR interval normal.3rd degree AVB = complete HB Answer- P-P wave consistent; but P & QRS don't match up P wave Answer- atrial depolarization PR interval represents? Answer- Onset (activation) of atrial depolarization to onset of ventricular depolarization.PR interval length ? Answer- 0.12-0.20 seconds P wave length Answer- < 0.11 QRS complex Answer- Depicts ventricular depolarization QRS complex length Answer- 0.4 - 0.11 (less than 3 small boxes)