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.
That's a lot like if you're pregnant, and the baby is squishing your bladder so much that you have to pee all the time. The process works like this: First, the water has to be absorbed into your bloodstream from your stomach and intestines (which can absorb about 1/4 Liter about every 15 minutes). Then, assuming you were already at optimal hydration levels, your kidneys would notice that there's more blood coming to them (because of the greater volume of fluid in the blood).