Some cells of the heart spontaneously depolarize. This is one of the reasons why people can have what's called ectopic firing where a part of the heart s o be the fastest, they e. So it has to be the fastest. Kind of the pace of the heart generated by the astest a de polarizing cell. And then you like then you get ri othms, that’s right. You get a rhythmes. That's muscle cells, muscle tissue, i should say, yo, i can.