What causes the instantaneous “stomach dropping” from dropping your phone or slamming a door?

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What causes the instantaneous “stomach dropping” from dropping your phone or slamming a door?

In: Biology

It triggers the fight or flight response. There’s a big network of nerves that connect your brain to your digestive system and your digestive system is made of involuntary muscles, so they tense when you have a sudden panic. Then blood is decreased to the digestive system and diverted into your heart, lungs, and muscles and you release adrenaline to prepare you for running or fighting.

Our fear response doesn’t know the difference between dropping our phone and a lion jumping out of a bush at us.