One of the biggest concerns in doctors that I have seen from watching TV is that flu pandemics if left untreated can turn deadly not within a matter of days but within a matter of minutes. Hope this helped.
The cells would become energy starved leading to ischemia and then infarction. This is if one was unable to do anything else to maintain the homeostasis.
You body however is able to utilize several mechabisms, primarily the use of fats and in extreme cases muscle tissue for the use of energy and ATP production through anaerobic metabolisis.
You should always maintain three points of contact on a ladder when moving up or down
There are no statements listed within the question. I can’t help with this amount of info
Stress can be caused by a lot of problems such as too much school/job work, family problems, money problems etc.