But just because you have a gym membership that you actually use doesnât mean you canât also have a few things at home for doing other types of workouts that you donât have time for at the gym, or for those days that you just canât make it out the front door.
The inside wall of the small intestine needs to be thin, with a really big surface area. This allows absorption to happen quickly and efficiently. If the small intestine had a thick wall and a small surface area, a lot of digested food might pass out of the body before it had a chance to be absorbed.
On a side note, not all water you drink is fully absorbed into your system, especially if you drink a lot of water. Much of it is flushed out in your urine, and some in your stool. If you want an interesting read on waterâs involvement in your bowels, the University of Michigan has a Bowel Function Anatomy. How can the body absorb more water?