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8 Cards in this Set
- Front
- Back
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What does most of the activity on an EKG represent?
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Contraction of the myocardium by electrical stimuli
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What is the state of "polarized" myocytes and what kind of electrical charge do they have?
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Resting state (not contracted)
Negative charge |
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What is the state of "unpolarized" myocytes and what kind of electrical charge do they have?
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Contracted state
Positive charge |
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What causes contraction of myocytes?
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Depolarization causes the negative interior of myocytes to become positive, resulting in contraction
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How does depolarization move through the heart?
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Moves as an advancing wave through the myocardium
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How is depolarization depicted on an EKG?
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A sharp spike
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How is repolarization depicted on an EKG
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A broad hump
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What are the skin sensors called that record the electrical activity of the heart?
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Electrodes
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