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Wigger's diagram labels: A

Atrial contraction

Wigger's diagram labels: B

MV and TV closure (1st heart sound, also ventricular contraction QRS)

Wigger's diagram labels: C

AOV opens

Wigger's diagram labels: D

Ejection of blood from ventricles

Wigger's diagram labels: E

AOV closure and 2nd heart sound

Wigger's diagram labels: F

Opening of AV valves (TV & MV)

Wigger's diagram labels: B to C

Isovolumic contraction

Wigger's diagram labels: E to F

Isovolumic relaxation

Define diastasis.

Middle stage of diastole during cycle of heart beat, where initial passive filling of the heart's ventricles has slowed down, but before the atria contract to complete the filling

What is the Wigger's diagram good for showing?

That the electrical activity (recorded on an EKG) actually occurs well before mechanical contraction of atria and ventricles

Atrial contraction begins where on EKG? and continues to where?

Begins in the middle of the P wave and continues throughout the PR interval

The PR interval delay is necessary for what?

Ventricles to fill after atrial contraction

On EKG, where does atrial repolarization occur?

During the QRS complex but is hidden by the QRS

When does atrial muscle relaxation occur?

After the QRS complex and is accompanied by a decrease in atrial pressure

On EKG, where does ventricular contraction occur?

Peak of QRS complex and continues during the ST segment and T wave

When does the MV close on an EKG?

Peak of QRS complex (due to an increase in ventricular pressure as ventricles contract)

On an EKG, when does isovolumic contraction occur?

Peak of R wave and end of S wave

On an EKG, when do the semilunar valves open?

End of S wave

On EKG, when does the ventricular contraction force blood out into aorta?

Beginning of T wave

On EKG, when do the semilunar valves close?

At the end of the T wave

On EKG, when does the mitral valve open?

0.05 seconds after end of T wave (this is the end of isovolumic relaxation)

On EKG, when does isovolumic relaxation occur?

Ventricular muscle repolarization end of systole, onset of ventricular diastole, begins at end of T wave and ends 0.05 seconds after end of T wave (points e & f on wiggers diagram)

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