SA cells are similar to another type of cell or tissue that you have learned about. Which tissue type is it? How is the SA node similar to this tissue?

I need help with that too‍♀️

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport