Problem: Why do AV nodal cells NOT determine the heart rate under normal circumstances? a. They depolarize faster than all other conducting fibers. b. They depolarize slower than all other conducting fibers. c. They slow conduction of the wave of excitation. d. As depolarization initiated in the SA node reaches the AV node, it leaves the AV node in a refractory state. e. The AV node is connected to the SA node, but not to other conducting fibers in the heart. 

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

a. They depolarize faster than all other conducting fibers. 

b. They depolarize slower than all other conducting fibers. 

c. They slow conduction of the wave of excitation. 

d. As depolarization initiated in the SA node reaches the AV node, it leaves the AV node in a refractory state. 

e. The AV node is connected to the SA node, but not to other conducting fibers in the heart.