Which of the following statements are TRUE? Increasing ventricular pressure increases ventricular volume. The S-T segment corresponds to ventricular repolarization. The P wave is commonly initiated by the AV node. • Ventricular pressure increases during the QRS complex.

What is occurring during ventricular ejection ? The AV valves are closed and the semilunar valves are open as blood is leaving the ventricles . The AV valves are open and the semilunar valves are closed as ventricular pressure is . increasing The AV valves are open and the semilunar valves are closed as blood is leaving the ventricles . The AV and semilunar valves are closed as ventricular pressure is increasing .

What is happening during the phase labeled with the arrow? Atrial depolarization Ventricular depolarization Ventricular repolarization or  AV valve closure

Which of the following structures acts to carry electrical impulse to the ventricles?       chordae tendineae     Purkinje fibers     papillary muscles     SA node

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

which of the following is the first to occur during the period of ventricular systole? QRS complex, sharp rise and ventricular pressure, or blood leaving the ventricle.

Which structure(s) (if any) do NOT produce action potentials (APs)?   SA node   Atrial muscle   AV node   Ventricle muscle   These ALL produce APs

During atrial fibrillation: A. The EKG shows an exaggerated P wave. B. There is a noticeable increase in the regularity of beating. OC. The ventricle undergoes reentrant refractoriness. OD. None of the above. OE. All of the above.

From doing his EKG in lab, Justin discovers his heart EKG has no P waves, which of the following would most likely not be true in this situation .   Group of answer choices a decrease in preload a slower than average heart rate an increase in afterload the AV node controlling heart contractions a lower stroke volume