Ans.
Definition: AV node is responsible for the delay in transmission of impulse generated in SA node. This delay in impulse transmission is called AV nodal delay. It is about 0.09 second.
Causes:
Importance:
For this delay, the atria get time to empty their content (blood) into the ventricles before ventricular contraction begins.
Definition: AV node is responsible for the delay in transmission of impulse generated in SA node. This delay in impulse transmission is called AV nodal delay. It is about 0.09 second.
Causes:
- Junctional fibers of AV node are very small in size.
- Resting membrane potentials of these fibers are much negative than the normal resting membrane potential of cardiac muscle.
- Very few gap junctions connect the successive fibers in the pathway, so that there is great resistance to the conduction of excitatory ions from one fiber to the next.
- Prolonged refractory period of AV node.
Importance:
For this delay, the atria get time to empty their content (blood) into the ventricles before ventricular contraction begins.
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