Cardiac Action Potential

Question 1

Phase 0

Answer 1

Sodium storms the gates and enters the cell.

Question 2

Phase 1

Answer 2

Potassium flees the cell
(Early repolarization)

Question 3

Phase 2

Answer 3

Sodium opens the gates for calcium to enter and calcium frees their own kind from the sarcoplasmic recticulm (calcium dependant calcium release)

Depolarization has occurred!

Question 4

Phase 3

Answer 4

Potassium efflux continues (rapid repolarization) and regroups outside myocyte

Question 5

Phase 4

Answer 5

Potassium enters the cells with the power of ATP in a Na/K pump kicking 3 sodium out for every 2 potassium.
Cell becomes inwardly negative meaning it is repolarized.