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9 Cards in this Set
- Front
- Back
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what is the hearts pumping action?
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sparked by special pacemaker cells and conduction fibers that initiate spontaneous electrical activity, causing muscle contractions that result in a heart beat. |
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where are the conduction pathways located?
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in the myocardium |
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what do the conduction pathways do? |
transmit the electrical pulse through out the heart |
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where is the SA node located? |
in the right atrium (it is called the pacemaker) |
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what does the SA node do? |
normally initiates the electrical impulses |
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where is the AV node located? |
in the lower part of the right atrium |
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what does the AV node do? |
it relays the impulse from the SA node to the bundle of His and through out the ventricles via the Perkinje fibers |
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what are the heart rate and rhythm influenced by? |
the autonomic nervous system |
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what can factors affecting the autonomic nervous system do? |
speed up or slow down the heart rate |
