BIOS30344 Lecture Notes - Lecture 15: Wiggers Diagram, Acetylcholine, Heart Sounds

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7 Dec 2017
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SA node excitation
Through AV node/bundle to R
P wave Atrial depolarization
Back to top of ventricles
Q-R-S complex Ventricular depolarization
T wave Ventricular repolarization and whole-heart relaxation
These mechanisms occur just after the
corresponding de/repolarizations
Electro Cardiogram
Tuesday, October 24, 2017
10:56 AM
Lecture 15 Page 1
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Passive filling into all areas of the heart 80% filling of ventricles
1.
Lub
a.
Atrial contraction Systole last 20% atriatoventricles - ~135mL
2.
QRS complex isovolumic ventricular contraction all valves are closed some tension, no
muscle shortening insufficient pressure to open semilunar
3.
Dupp
a.
Ejection full muscle shortening from apex to base opens semilunar valves into arteries
4.
T to P
a.
Relaxation isovolumic ventricular relaxation
5.
Passage
Blood Flow in Heart
Tuesday, October 24, 2017
11:24 AM
Lecture 15 Page 2
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