• Created by: dxni1604
  • Created on: 29-09-18 16:46


Digestion breaks down large food molecules into smaller molecules such as clucose, amino acids and fatty acids that can be easily absorbed. Carbohydrates, proteins and fats are made up of large molecules that cannot be readily absorbed in that way. Small food molecules are usually absorbed in the small intestine, diffusing across the intestine wall and into the bloodstream.

How is the small intestine adaped?

The wall of the small intestine is lined with many tiny figure-like projesctions called villi.These are very thin and increase area of the small intestine, both which increase the speed of diffusion.

What is osmosis?

Osmosis is the diffusion of water molecules from a low concentration to a high concentration solution, across a partially-permeable membrane. A partially-permeable membrane has hooles in it that permit water molecules through but are too small to allow larger molecules through. Osmosis


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