Electrocardiogram (ECG) Flashcards
1
Q
Define systole
A
-contraction phase of the cardiac cycle
2
Q
Define Diastole
A
-relaxation phase of the cardiac cycle
3
Q
The intrinsic regulation of systole and diastole, unique to the heart, is called?
A
-rhythmicty
4
Q
Which region of the heart regulates the cycle of the entire myocardium?
A
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
5
Q
What is the pathway of a depolarizing wave through the heart?
A
1) SA node
2) AV node
3) AV bundle/bundle of His
4) purkinje fibers
6
Q
The heart is innervated by which 2 nerves?
A
- sympathetic
- parasympathetic
7
Q
How do sympathetic fibers effect the heart?
A
-increase the velocity of both impulse conduction and ventricular contraction
8
Q
What does an ECG monitor and what does each part of the wave detect?
A
-monitors the electrical activity generated by the heart as it travels through the body
