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.
Not only does the digestive system break down the food, its also responsible for absorbing the nutrients. The absorbsion takes place in the small intestine, which has finger-like projections called villi. The villi increases the surface area which in addition makes more room for more nutrience to be absorbed. Nerves, both inside and outside the digestive system, help to regulate the functions of the system.