One of the two primary thyroid hormones and influences the rate of metabolism

Actually the two primary harmones produced by our thyroid gland is thyroxine or tetraiodothyronine which is shortly called as T4 harmone and then triiodothyronine which is know as T3 harmone, which helps and influences the rate of metabolism, by regulating the blood glucose levels in our body.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.