Many body systems work together for proper functioning of the body and to maintain internal homeostasis. The works to break down food eaten before exercising. The takes in the nutrients obtained from the food. The body sweats as a mechanism to cool off, because the is working to flush out toxins.

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i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!