A&P lab ECG || with A+ Guaranteed Solutions.

action potentials correct answers ECG measures electrical activity that passes through heart through _____ (does not measure physical contraction of heart) pacemaker cells correct answers cells located in SA node; set rhythm of heart by spontaneously depolarizing (don't require neural stimulus) sinus rhythm correct answers rate that pacemaker cells make AV node (slower) correct answers what takes over if the SA node is damaged and cannot produce rhythm of heart ectopic focus correct answers when other cells in heart spontaneously depolarize when they aren't supposed to; can impact contractions electrical conducting cells correct answers transmit electrical stimulus (rhythm) into the myocardium from start point -atrial [more variable in appearance] and ventricuar conduction system myocardial cells (cardiac muscle) correct answers rich in actin and myosin for contraction -branch and one/two nucleus -EKG waves are a result of action potentials generated in _______ pacemaker potential correct answers slow depolarization due to opening of Na+ channels and closing of K+ channels in pacemaker cells, gradually pulls RMP up calcium correct answers ion that rushes into pacemaker cells during depolarization -- causes pacemaker depolarization plateau correct answers effect of slow Ca+ channels open allowing positive ions in, even though some K+ channels are open and letting positive ions out -- keeps cell depolarized -- absolute refractory period SA node --(internodal pathway)- AV node -- AV bundle -- bundle branches -- purkinje fibers correct answers pathway of electricity through heart delay at AV node correct answers what allows the atria to contract from depolarization signals slightly before ventricular contraction P wave correct answers EKG wave for atrial depolarization; first half of wave represents depolarization of right atria and second half represents depolarization of left atria