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Digestion is the breakdown of insoluble food molecules into small water-soluble molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these substances are absorbed through the small intestine into the blood stream. is a form of catabolism that is often divided into two processes based on how food is broken down: mechanical and digestion. The term mechanical digestion refers to the physical breakdown of large pieces of food into pieces which can subsequently be accessed by digestive enzymes. In chemical digestionenzymes break down food into the small the body can use.

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