Test: AP Biology

1.

The sinoatrial node generates action potentials at a faster pace than normal heart rate. Why does the heart beat more slowly than the SA node would dictate?

The atrioventricular node requires multiple action potentials in order to continue the electrical signal through the heart.

Many of the action potentials are not large enough to cause a contraction of the heart.

The parasympathetic vagus nerve slows down the heart rate.

Half of the action potentials are dedicated to the contraction of the atria, and the other half are dedicated to the contraction of the ventricles.

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