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What is AV nodal delay is: and explain in detail?
Velocity of impulses at different parts of conductive system:

Atrial muscle fibers : 0.3 meter/second
Internodal fibers : 1.0 meter/second
AV node : 0.05 meter/second
Bundle of His : 0.12 meter/second
Purkinje fibers : 4.0 meter/second
Ventricular muscle fibers : 0.5 meter/second

Thus, the velocity of impulses is maximum in Purkinje fibers and minimum at AV node.