Describe what is happen in each phase of the cardiac cycle below. SA node AV node R the RO as R h 85 OS G R O Depolarization D (6) Repolarization Q R S S R D SI

isovolumetric contraction isovolumetric relaxation ventricular filling ventricular ejection closed rises S1 drops depolarize S2 The first phase of the cardiac cycle is . This is when a lot of blood is in the atria, which causes atrial pressure to be higher than the ventricles. The atrioventricular valves open, and blood moves from the atria to the ventricles. At the end of this phase, the atria contract to maintain pressure and blood flow into the ventricles. As blood leaves the atria, the pressure in the atria As blood enters the ventricles, the pressure in the ventricles Towards the end of this phase, the pressure in the ventricles will exceed the pressure in the atria. At this point, the heart enters the second phase of the cardiac cycle: At this point, the AV valves shut, and we hear . The atria repolarize and the ventricles (due to the QRS complex of the ECG), causing ventricular contraction. Although contracting, it is not yet moving blood into the arteries. All 4 heart valves…

A patient has a condition in which the SA node is no longer functioning. The atrioventricular (AV) node is now setting the pace and rhythm for the heart. What difference would you expect to see in the ECG of this patient? Group of answer choices P wave would be much larger than normal there would continue to be a normal sinus rhythm QRS complex would be absent the rhythm would be slower

What is the cardiac rhythm? II wwwwwwwwwwww Ventricular tachycardia Sinus tachycardia Supraventricular tachycardia Atrial fibrillation with rapid ventricular response