Cardiac Physiology

4. This mechanism is important for venous return during exercise
9. The mechanism that slows the SA node’s rate to around 70 beats/min, controlled by the ____ nerve
10. The electrical activity represented by the P wave on an ECG
15. The difference between systolic and diastolic blood pressure
16. Heart sound from the closing of the semilunar valves
18. The ECG wave representing repolarization of the ventricles
19. Nervous system that slows heart rate and stimulates intestinal activity
23. This node in the right atrium initiates the heart's electrical impulses

1. The principle stating that the heart contracts more forcefully when the volume increases
2. The volume of blood pumped by each ventricle per beat
3. The resistance the heart must overcome to eject blood during systole
5. The volume of blood pumped by the heart per minute
6. Myocardial cells' plateau phase is caused by the influx of these ions
7. Heart sound from the closing of the atrioventricular valves
8. The ECG wave representing ventricular depolarization
11. The phase when the heart muscle relaxes and fills with blood
12. This decreases right after standing up from a lying position
13. The volume of blood remaining in the ventricles after contraction
14. Valves that close during diastole to prevent backflow into the ventricles
17. The long refractory period in cardiac muscle prevents this abnormal, sustained contraction
20. This vessel receives blood during ventricular systole
21. The amount of blood that fills the ventricles before they contract
22. Baroreceptors that detect blood pressure are located in this large artery and the neck