I agree, but it's a good basis for general knowledge of what is going on biologically during anxiety. Science can't explain everything and everyone is very different, but there are still functions everyone's bodies have in common. I just personally found this helpful and wanted to share in case it helped anyone else.
Just want to say, this article aside, science still doesn't have the answer as to why anyone gets anxiety or depression. Nor does everyone get the same symptoms. Just wanted to say that so that anyone reading this type of thing won't get discouraged or invent symptoms.