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.
Absorption occurs in the digestive system when the nutrients move from the gastrointestinal tract to the blood or lymph. Defecation is the process of expelling what the body couldn't use.itamin c). Once the chyme leaves the small intestine, most of the nutrients have been absorbed and only waste products and water remain; this is called liquid stool.   The small intestine is where the majority of food digestion occurs.