Het cardiovasulaire system - Phys Chptr 13: The cardiovasular system: Cardiac function
7 important questions on Het cardiovasulaire system - Phys Chptr 13: The cardiovasular system: Cardiac function
What does the blood consist of?
What is a portal circulation?
What is the conduction system?
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Why are gap junctions and desmosomes important?
For what two reasons does the AV node not generate potentials by itsself?
The action potentials originating in the SA node travel through the AV node on their way to the ventricles, during this refractory period the cells cannot generate their own potential.
The second reason is that the SA node has a higher beat frequency, the SA node would always beat the AV node to the chase.
The AV can though step up as a back up if the SA node would miss a beat or if the pathway was blocked..
What if the AV or SA node does not work?
The AV can step up as a back up if the SA node would miss a beat or if the pathway was blocked.
If the AV node can't drive the ventricular contraction, the heart has another backup- certain cells in the Purkinje fibers (idioventricular pacemakers), eventhough they are slower.
With an ECG, what is the p wave, QRS complex and the T wave?
The P waves is an upward deflection that is due to artrial depolarization. The QRS complex is a series of sharp upward and downward deflections due to ventricular depolarization. The t wave is an upward defletion caused by ventricular contractile cell action potential.
The p-Q or P-R interval is an estimate of conduction through the AV node.
The Q-T intercal is the time the ventricles are contracting.
The T-Q segment is an estimate of the time the ventricles are relaxing
The R-R interval is the time between heartbeats.
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