conduction of impulses

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9 Terms

1
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how are APs velocity conducted

conducted at different velocities throughout specialized myocardial cells

2
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spread of AP’s generate at SA node

spread rapidly to atria & av node at .8-1 meters a second

3
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AP @ AV node

Ap velocity slows down to .003-.05m/sec

4
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what does reduced velocity allow for

allows for delay in ventricular contraction

5
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why doe reduced velocity allow for delay 

bc atria must contract 1st so ventricles get chance to fill with blood 

6
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AP velocity @ AV bundle

speeds up

7
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AP velocity @ purkinje fibers

speeds up to 5m/sec and then goes to ventricular walls

8
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AP @ ventricular walls

spread throughout and causes ventricular contraction

9
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when do ventricles contract

.1→.2 seconds after atria