Select the best response from the answer choices following each question.
2. Which electrolyte exits the cardiac cell leading to cellular polarization?
3. Which landmark in the heart’s conduction system has the slowest inherent rate?
4. At times, foci within the heart may fire at a rate faster than the SA node rate and take over as the heart’s pacemaker. This is known as:
5. The terminal portion of the heart’s conduction system is the: