Here are a list of events that involve changes to genotype and phenotype. Arrange these events in sequential order, from first t

Answer:

E. All of the above

Explanation:

During the process in cardiac contractile cells, an initial rapid depolarization occurs, followed by a plateau phase and then repolarization.

When an action potential triggers the cell, voltage-gated channels open swiftly, initiating the depolarization positive-feedback loop. This action elevates the membrane potential to around +30 mV, which subsequently causes the sodium channels to close. Following this is the plateau phase, characterized by a gradual decline in membrane potential due to the activation of slow Ca2+ channels that permit Ca2+ influx, along with limited K+ channels being open, resulting in K+ efflux. Once the membrane potential approaches zero, the Ca2+ channels close, and K+ channels open, facilitating K+ exiting the cell. Repolarization then continues for some time, during which the membrane potential falls back to resting levels, completing the cycle.