Like when you hear a balloon pop or someone comes up behind you.
2007-03-02 10:19:30 · 5 answers · asked by anakinjade1 2 in Health ➔ General Health Care ➔ Other - General Health Care
It has to do with the fight or flight mechanism that is built in to our body.
2007-03-02 10:27:02 · answer #1 · answered by sokokl 7 · 0⤊ 0⤋
your body has two major excitatory chemicals called adrenalin and noradrenaline (or epinephrine and norepinephrine in the US). These are released when you get a fright or during excitement. They cause blood flow and tension in the muscles. This is because our evolutionary history is basically one of flight (running away) fight and fright from predators and other dangers, though this is far less so these days. Blood flow and tension in muscales enables you to run away or fight and thus save your own life. You can imagine that ancestors who did not possess this ability got killed before they could pass on their genes to offspring whereas people who had this reaction mechanism survived!
2007-03-02 10:38:11 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I don't know but are you saved do you have the power of God in your life if you don't you really need him ! If you want him pray this prayer,father right now I need you and I want you I want my heart to be new I know anything is possible wih you and I love you!So I am praying this prayer for you to come into my heart! I love you and I need you!
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2007-03-02 10:30:09 · answer #3 · answered by Anna Claire Y 1 · 0⤊ 0⤋
It's a natural instinct for your body to react that way when it is not expecting something to happen. Your muscles tighten up.
2007-03-02 10:24:06 · answer #4 · answered by devilgal031948 4 · 0⤊ 0⤋
it has do do with chemicals in your brain and it a natural saftey for your own protection
2007-03-02 10:23:39 · answer #5 · answered by jassmine91601 1 · 0⤊ 0⤋