physioligy of heart

6. The circulation system that supplies blood to the heart muscle itself.
8. Cranial nerve that primarily carries parasympathetic signals to the heart, slowing the rate.
10. The electrical event in a cardiac cell that causes contraction.
11. The period of the cardiac cycle when the heart is relaxed and filling with blood.
12. Specialized conducting fibers that rapidly distribute the action potential to the ventricular muscle.
13. The outermost protective layer of the heart wall (or visceral pericardium).
15. The major artery leaving the left ventricle, distributing oxygenated blood to the systemic circulation.
16. Lower, thick-walled chamber of the heart that pumps blood out.

1. Abnormally rapid heart rate, typically over 100 beats per minute.
2. The muscular tissue of the heart.
3. The intrinsic strength of the heart muscle independent of preload or afterload.
4. The volume and associated pressure in the ventricle at the end of diastole.
5. The natural structure that initiates the heartbeat.
7. The volume of blood pumped out by the left ventricle with each beat (two words).
9. The period of the cardiac cycle when the ventricles contract and eject blood.
14. Upper chamber of the heart that receives blood.