Cardiovascular Physiology - McKee Unit 2

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19 Terms

1
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SA node (sinoatrial node)

-pacemaker of the heart

-sets the heartbeat rate

-located in the right atrium

-causes atria to contract

<p>-pacemaker of the heart</p><p>-sets the heartbeat rate</p><p>-located in the right atrium</p><p>-causes atria to contract</p>
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internodal fibers

between SA & AV nodes carry stimulation throughout both atria

<p>between SA &amp; AV nodes carry stimulation throughout both atria</p>
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AV node (atrioventricular node)

Conduction relay node between the atria and ventricles. Signal from the SA node travels through the AV node to the ventricles

<p>Conduction relay node between the atria and ventricles. Signal from the SA node travels through the AV node to the ventricles</p>
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AV bundle (bundle of His)

fibers in the heart that relay a nerve impulse from the AV node to the ventricles

<p>fibers in the heart that relay a nerve impulse from the AV node to the ventricles</p>
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AV bundle branches

Give rise to purkinje fibers leading to papillary muscles

<p>Give rise to purkinje fibers leading to papillary muscles</p>
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Purkinje fibers

specialized conductive fibers located within the walls of the ventricles

<p>specialized conductive fibers located within the walls of the ventricles</p>
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P wave

atrial depolarization

<p>atrial depolarization</p>
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PR segment

AV nodal delay

<p>AV nodal delay</p>
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PR interval

length of time for atria to depolarize and contract. measured from the beginning of P-wave to the start of QRS complex

<p>length of time for atria to depolarize and contract. measured from the beginning of P-wave to the start of QRS complex</p>
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QRS complex

ventricular depolarization and atrial re-polarization

<p>ventricular depolarization and atrial re-polarization</p>
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QRS interval

length of time for ventricles to depolarize; atrial re-polarization occurs at the same time

<p>length of time for ventricles to depolarize; atrial re-polarization occurs at the same time</p>
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ST segment

time between ventricular depolarization and repolarization

<p>time between ventricular depolarization and repolarization</p>
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ST interval

time from the end of ventricular depolarization to ventricular re-polarization completion

<p>time from the end of ventricular depolarization to ventricular re-polarization completion</p>
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T wave

ventricular repolarization

<p>ventricular repolarization</p>
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QT interval

ventricular depolarization and repolarization

<p>ventricular depolarization and repolarization</p>
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ventricular fibrillation

the rapid, irregular, and useless contractions of the ventricles

<p>the rapid, irregular, and useless contractions of the ventricles</p>
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atrial fibrillation

rapid, random, ineffective contractions of the atrium

<p>rapid, random, ineffective contractions of the atrium</p>
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Atrial Flutter

irregular beating of the atria; often described as "a-flutter with 2 to 1 block or 3 to 1 block"

<p>irregular beating of the atria; often described as "a-flutter with 2 to 1 block or 3 to 1 block"</p>
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heart sound locations

areas where the valves can be auscultated

<p>areas where the valves can be auscultated</p>