How does digestive system work?

Check this out: Follow this link to learn more about the anatomy & physiology of the digestive tract (http://www.Dasilvainstitute.Com/gastrointestinal-anatomy-physiology) summary: the GI tract is a single cell barrier of protection between the outside world & the inside of our body. Immune cells are numerous here. It digests (breaksdown) foods, and absorbs the nutrients & water to enter our blood stream.

Absorbs Nutrients: That's a very complicated question and there is not an easy answer. The body breaks down the food you eat to its component parts and then absorbs that to create energy. You can find a lot of information at your local library or on the internet.