Why Do AV Nodal Cells NOT Determine the Heart Rate

Multiple Choice

Why do AV nodal cells NOT determine the heart rate under normal circumstances?

A) They depolarize slower than all other conducting fibers.
B) They slow conduction of the wave of excitation.
C) They depolarize faster than all other conducting fibers.
D) The AV node is connected to the SA node, but not to other conducting fibers in the heart.
E) As depolarization initiated in the SA node reaches the AV node, it leaves the AV node in a refractory state.