Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat?

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

Pe.dometer would be the most useful to you for monitoring heart rate.

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A.) just took it and made 100%