The small intestine is where virtually all nutrient absorption occurs. After the body digests food, the nutrients pass through the walls of the small intestine and enter the bloodstream through passive diffusion and active transport absorption. Passive diffusion is a process involving the transport of nutrients from an area of high concentration (intestine) to an area of low concentration (bloodstream). The nutrients passed through active transport absorption are assisted by carrier molecules to get through the intestinal wall.
The small intestine is the place where pretty much all of the nutrients in the food we eat are absorped into the bloodstream. In the small intestine, our food molecules are pretty much liquids made of macromolecules. These macromolecules are exposed to bile and pancreatic enzymes, which allow them to be broken down to micromolecules that can be absorbed. On the surface of the small intestine, water and electrolytes, along with organic molecules such as glucose, are absorbed. They are absorbed through the use of gradients and other processes.
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