BIOS255 CARDIAC CYCLE EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED

BIOS255 CARDIAC CYCLE EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED Terms in this set (16) Depolarization Which event of an action potential is defined by an influx of sodium ions? Plateau Depolarization Hyperpolarization Repolarization Pulmonary Valve Which valve prevents the backflow of blood into the right ventricle? Mitral valve Aortic valve Pulmonary valve Tricuspid valve Bicuspid valve Left Ventricle Which chamber of the heart has the thickest wall? Right atrium Left atrium Left ventricle Right ventricle SA node fires - Initiates the electrical impulse. Signals travel through the atria - Atrial contraction begins. AV node fires - Delays the impulse briefly. Signals travel to the AV bundle (Bundle of His) - Conducts the impulse to the ventricles. Signals travel along left and right bundle branches - Distributes the impulse to the Purkinje fibers. Purkinje fibers fire - Causes rapid ventricular depolarization and contraction. Place the events of the conduction system in the proper order, from first to last. Ventricles depolarize: QRS Complex Atria Depolarize: P Wave Ventricles Repolarize: T Wave Match each event of the cardiac cycle with the corresponding component of an EKG. Contraction of the heart chambers What does the term "systole" refer to in the cardiac cycle? Filling of the ventricles Filling of the atria Contraction of the heart chambers Emptying of the ventricles Relaxation of the heart chambers Ventricular filling: Open, Closed Isovolumetric contraction: Closed, Closed Ventricular ejection: Closed, Open Isovolumetric relaxation: Closed, Closed Identify whether the atrioventricular (AV) valves and semilunar valves are open or closed in each event. An indication of bradycardia A client presents with a resting heart rate of 50 bpm. The nurse recalls that this heart rate is what? An indication of bradycardia Within normal range for a newborn infant Within normal range for a young adult male An indication of tachycardia