Why Do AV Nodal Cells NOT Determine the Heart Rate

question 53

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

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