unit 4 - heart structure

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6 Terms

1
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What is the main structure of the cardiovascular system?

heart

2
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Where is the fibrous skeleton located?

Between the atrial and the ventricular unit.

3
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What is depolarization?

contraction

4
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What are two characteristics of depolarization?

involves a rhythmic pattern and a spontaneous impulse.

5
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What percentage of the heart can work automatically or is self-excitable?

Less than 1%.

6
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What are the self-excitable cells of the heart called?

Pacemaker cells.