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Action of sucrase on sucrose

Sucrose binds to the active site on sucrase.

Adenosine triphosphate

The structure of adenosine triphosphate showing phosphates linked to ribose and adenine.

Bacterial competition

Bacterial competition for adhesion sites on the large intestine.

Breakdown of glucose

Breakdown of glucose within the cell cytoplasm and mitochondria.

Cell featuring mitochondria

Mitochondria are tiny organelles present in body cells.

Cubes of food

Surface area increases as particle size decreases.


Cyanidin, a plant polyphenol, is found in red-coloured fruits and vegetables.

Denatured enzyme

At high temperatures, the shape of the protein is altered.

Digestion and satiety research

Human digestive system showing the sites of the 3 main mechanisms targeted in satiety research.

Dr Ingram in the lab

Dr John Ingram at work in his laboratory.

Dr Juliet Ansell in the lab

Dr Juliet Ansell is a science group leader at Plant & Food Research.

Energy balance

The scales represent the balance between energy in and out.

Enzyme activity and pH

Enzymes are pH-sensitive protein structures.

Fermentation in the large intestine

Products of fermentation of carbohydrate in the large intestine.

Gut hormones

Some gut hormones and their sites of production.

Hormone action

Specialised cells known as endocrine cells produce hormones.

Human digestion chemistry

The human digestive system.

Human digestive system

The main organs of the human digestive system.

Hydrolysis reaction

Hydrolysis reactions use up water molecules to break bonds.

Obesity health problem

Obesity cartoon showing health problems associated with obesity.

Rate of reaction and temperature

Graph of the rate of digestion of starch versus temperature.

Scientists at Plant & Food Research

Dr Juliet Ansell and colleague Dr Kerry Bentley-Hewitt.

The large intestine

The large intestine consists of the caecum, colon, rectum and anal canal.

Total daily energy expenditure

Percentage breakdown of components that make up total daily energy expenditure.

Unlocking ATP energy

Conversion of ATP to ADP releases energy.

Villi in the small intestine

Villi increase the surface area of the small intestine.