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 Long acting calcium channel act in which pa of action potential? and explain in detail?
Phases Characteristics 0 (depolarization) Opening of fast Na channels. 1 (initial repolarization) Closure of fast Na channels & K+ efflux through open K+ channels. 2 (plateau) L - type slow Ca++ channels open & fast K+ channels close. 3 (rapid repolarization) Ca++ channels close & slow K+ channel open. 4 (resting membrane potential) Average around - 90 mv.