It depends on the disease, I would say mental confusion tho. But all of these could happen to a person, only depends on the disease
I believe you should take a year off and do every prereq you can get at a local college or university. a way to check that would be to go on a computer and pull up the local college, and the college you set your mind to long term. so for instance LTC (long term college) may have a prereq Bio 213 and maybe you LC (local college) has a Bio 217. you would call the LTC and say hey, does your Bio 213 line up with LC Bio 217. Most of the time they will say yes. It saves a LOT of money.
When your body develops a tolerance for a medication the body gets used to it being there thus making the medication ineffective.
The measure of how well your heart gets oxygen rich blood to your muscle while you're exercising is called anaerobic fitness is the correct answer.
Hope it helped you!