Electrocardiogram (ECG) Flashcards
Define systole
-contraction phase of the cardiac cycle
Define Diastole
-relaxation phase of the cardiac cycle
The intrinsic regulation of systole and diastole, unique to the heart, is called?
-rhythmicty
Which region of the heart regulates the cycle of the entire myocardium?
SA (sinoatrial) node
- serves as the normal pacemaker of the heart - establishes its dominance because its cycle is more rapid than other areas, depolarizing the other myocardial cells before they can depolarize themselves
What is the pathway of a depolarizing wave through the heart?
1) SA node
2) AV node
3) AV bundle/bundle of His
4) purkinje fibers
The heart is innervated by which 2 nerves?
- sympathetic
- parasympathetic
How do sympathetic fibers effect the heart?
-increase the velocity of both impulse conduction and ventricular contraction
What does an ECG monitor and what does each part of the wave detect?
-monitors the electrical activity generated by the heart as it travels through the body