Chemical: Chemical digestion breaks down large, insoluble molecules into smaller, soluble ones. This is carried out by enzymes.All digestive enzymes function by hydrolysis. This is when molecules are split up by adding water to the chemical bonds that hold them together.There are different enzymes that break down different things. These are:
Carbohydrases break down carbohydrates to monosaccharides.
Lipases break down lipids into glycerol and fatty acids.
Proteases break down proteins to amino acids.
The molecules that are absorbed( the ones listed above) are carried to different parts of the body and are often built up into large molecules again. However,these are not necessarily of the same type as the molecules from which they were derived, These molecules are incorporated into body tissues and/or used in processes within the body.This is called assimilation.
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