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3

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 ...


10

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 ...


5

This is happening due to sodium channel inactivation. Some relevant sources: https://en.wikipedia.org/wiki/Ball_and_chain_inactivation 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) https://neuronaldynamics.epfl.ch/online/Ch2.S2.html In the ...


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