Ecg Orientation Kaiser || A Verified A+ Pass.

DEPOLARIZATION correct answers Movement of ions (Na+, Ca+, K+) across cell membrane causing inside of cell to become more positive, electrical conduction results in contraction. Na+ channels open. Positive inside, negative outside. REPOLARIZATION correct answers movement of ions across cell membrane where inside of cell is restored to its negative charge. Sodium channels close. Potassium channels open. Active transport by sodium-potassium pump DEPORIZATION correct answers ELECTRICAL CONTRACTION correct answers IS MECHANICAL. CONTRACTION FOLLOWS DEPOLARIZATION. WHAT OCCUR FIRST? ELECTRICAL CONDUCTION, OR MECHANICAL CONTRACTION? correct answers ELECTRICAL CONDUCTION P WAVE correct answers ATRIAL DEPOLARIZATION QRS correct answers VENTRICAL DEPOLARIZATION T WAVE correct answers ventricular repolarization REFRACTORY PERIOD correct answers the period of resistance to stimulation, cardiac cells unable to respond to stimulus relative refractory period correct answers cardiac cells have repolarized enough to respond to strong stimulus automaticity correct answers Ability of pacemaker cells to spontaneously initiate an electrical impulse, SA node, AV junction, and Purkinje fibers excitability correct answers ability to respond to stimuli conductivity correct answers Ability to receive an electrical stimulus and conduct that impulse to adjacent cells - all cardiac cells possess this. contraction correct answers Cardiac cells shorten, causing muscular contraction in response to an electrical stimulus SA node correct answers Sino-atrial node; the pace-maker of the heart; where the impulse conduction of the heart usually starts; located in the top of the right atrium. 60-100 bpm