Well you haven't provided any answer options so answer options include things like mountain climbing. Mountain climbing involves multiple systems and functions over a long period, with moderate being something like hiking the same mountain.
HIV is directly related to aids unlike any other infectious disease.
To me that sounds like a panic attack. “Feeling weak, faint or dizzy” “breathing difficulties” and shaking comes from the fear and quick heartbeats
I think the word is Biomagnification
