Bio9 - Heart sounds, ECG

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14 Terms

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P wave

atrial depolarization

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QRS complex

ventricular depolarization and atrial repolarization

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T wave

ventricular repolarization

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Diastole

fill and rest

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Systole

eject/contract (stressed)

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<p>atrioventricular valves (AV)</p>

atrioventricular valves (AV)

mitral and tricuspid

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<p>semilunar valves</p>

semilunar valves

pulmonary and aortic

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SA node (sinoatrial node)

pacemaker of the heart, produce APs

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ECGs record what

P, QRS and T waves

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1st sound (lub)

AV valves close

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2nd sound (dub)

semilunar valves close

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<p>the last electrical event before the AV valves close and the first heart sound occurs</p>

the last electrical event before the AV valves close and the first heart sound occurs

R (QRS)

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<p>the electrical signal leading up to the semilunar valve closure and the second heart sound.</p>

the electrical signal leading up to the semilunar valve closure and the second heart sound.

T wave/ventricular repolarization

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Ventricular contraction begins right after the

R wave