Nrdsb4, I just wanted to comment that I have found your posts very helpful in thinking about general medical issues. Until one starts to ask questions, one often does not know what questions to ask. Then the answers to those open up new questions.
So if you do not mind: When a person’s mental state causes the heart rate to increase, is that totally hormonal, or is the nervous system involved?
In case the moderators are looking over my shoulder for relevance to the McMath case, Jahi’s mother has stated that Jahi’s heart rate increased when she (the mother) talked with her, or when she entered the room (I have forgotten the specifics, but I know that an increase in heart rate was mentioned). Again, not trying to change the view of when Jahi died, just trying to understand the case better.