Multiple ChoiceMore than one choice may apply.Which of the following depolarizes next after the AV node?a. b. c. d. e.

Cardiac contractile tissue uses sodium, calcium, and potassium channels for depolarization and repolarization. During which phase of the action potential is the calcium channel open?

How would you expect the absolute refractory period of a contractile cell to change if more potassium channels opened sooner after polarization?

The movement of ions in opposite directions at the same time is responsible for which of the following?

Which statement below correctly describes how the channels that are active during the pacemaker potential are different from other ion channels used in action potentials?