Do you ever feel in awe of the human body? I sure do! In the blink of an eye, if it senses danger, it increases your heart rate, oxygen intake, and body temperature. It instantly produces chemicals, hormones, tenses muscles, decreases your metabolism, AND shuts off part of your brain. It does this to prepare to fight an attacker, run away, or freeze until it's safe. Just by thinking a simple thought the body automatically fires off those messages.