Electrocardiogram (ECG) Flashcards

1
Q

Define systole

A

-contraction phase of the cardiac cycle

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2
Q

Define Diastole

A

-relaxation phase of the cardiac cycle

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3
Q

The intrinsic regulation of systole and diastole, unique to the heart, is called?

A

-rhythmicty

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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
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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

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6
Q

The heart is innervated by which 2 nerves?

A
  • sympathetic

- parasympathetic

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7
Q

How do sympathetic fibers effect the heart?

A

-increase the velocity of both impulse conduction and ventricular contraction

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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

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