Echo Registry Review| 600 Questions| Correct Solutions

Produced when a signal from the SA node spreads through the atria on a ECG - ANSWER P-Wave Detects electrical current in the heart - ANSWER Electrocardiogram Generated by ventricular repolarization - ANSWER T-Wave produced when signal from AV node spreads through ventricular myocardium and depolarizes muscle - ANSWER QRS complex The heart beats due to this - ANSWER autorhythmicity Charge shifts from negative to positive - ANSWER Depolarization Nerve like process that spreads action potential through ventricular myocardium - ANSWER Purkinjefibers Primary Pacemaker cell of the heart - ANSWER SA Node Short branched cell found in the heart - ANSWER Cardiocyte Stores and pumps calcium ions - ANSWER Sarcoplasmic reticulum Plateau phase of the cardiac action potential - ANSWER Phase 2 Begins halfway through Phase 0 until part way thru phase 3 - ANSWER (Absolute ) Refractory period allow action potential to spread through cells - ANSWER Gap junctions Fast Na+ channels open in this phase - ANSWER Phase 0 Phase in which cell is not stimulated ( resting membrane potential ) - ANSWER Phase 4 Autoarythmic cells are also known as - ANSWER pacemaker cells Phase 4 in autoarythmic cells differ from phase 4 in cardiocytes in which way ? - ANSWER phase 4 in autoarythmic cells has no stable resting membrane where as in cardiocytes, phase 4 has a resting membrane potential.