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

心率加快，呼吸困难，胃不适，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.

你真不把血液输送到你胃，因为现在不是消化你刚刚吃时候。

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，即摄入；二是消化，将分解成营养成分；三是吸收，即把营养成分吸收入血液；四是排遗，即排出不消化吸收废。