nervous system. digestive system. immune system. excretory system.
I gave my students this multiple choice question: The position of the liver in the circulatory system maximizes its ability to filter out harmful chemicals as soon as they enter the bloodstream. Blood travels to the liver from the

Only one answer is correct among these 4 choices:
- nervous system.
- digestive system.
- immune system.
- excretory system.

Could you tell me which one is correct?

digestive system.