The answer by Bryan Krause is right on point from a system's perspective.
From a cardiology point of view, heart rate recovery (HRR) post-exercise has been a significant consideration in cardiopulmonary exercise testing (CPET) in recent years.
Put succinctly, heart rate is influenced by the sympathetic and parasympathetic nervous systems. Increased ...
I think most people would take exponential decay in a circumstance like this to be the null hypothesis. That is, if you had something not exponential decay, that would be curious and interesting and worth understanding better.
Exponential decay is a pretty fundamental concept in the universe in general and biology in particular.
So, the exponential decay ...
This is happening due to sodium channel inactivation. Some relevant sources:
https://www.st-andrews.ac.uk/~wjh/hh_model_intro/ (I guess this link is broken for some people? works fine for me as-is; see the links before and after instead, then)
In the ...