So a fast heart rate, trouble breathing, kind of queasiness in our gastrointestinal system, this is a fight-or-flight response being activated.

心率，吸困难，胃肠系统不适，这是一种战斗或逃跑反应被激活。

And you really don't wanna send blood to your gastrointestinal system 'cause now is not the time to digest that food that you just ate.

你真的不把血液输送到你的肠胃系统，因为现在不是消化你刚刚吃的食物的时候。

The main job of the gastrointestinal system is ingestion - taking in food, digestion - breaking it down into nutrients, absorption - pulling these nutrients into the bloodstream, and finally, excretion - getting rid of waste.

消化道有四大功：一是进食，即摄入食物；二是消化，将食物分解成营养成分；三是吸收，即把营养成分吸收入血液；四是排遗，即排出不消化吸收的废物。