Earlier quoted context omitted.
Is there any actual differece to a muscle if you think about it and it happens?
I'd consider "controlling" something to be more direct, but that's semantics I guess. If I heard "control heartbeat", I'd think more like breathing, where one could "hold their heart" like they "hold their breath". If meditation lowers heartbeat and temperature, I imagine that it's "control" in the strictest sense, but I'd use "influence" or some other term if I was personally describing it.
> one could "hold their heart"
… now that sounds creepy.