You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Initial rapid repolarization in cardiac muscle is mediated through and explain in detail?
The main factor is opening of K+ channel. Although Ganong has maintained both closure of Na+ channels and opening of one type of K+ channel and closure of Na channel only the recent concept is K+ channel opening is the main reason of phase 1.