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Hydrochloric acid

Mineral acid, made in the stomach

Digestive system

The organ system in the body which breaks down large insoluble food molecules into small soluble molecules which can be used by the body

Balanced diet



Breaking down the large insoluble food molecules into small soluble molecules


A list of often difficult or specialised words with their definitions.






Yellowy-green alkaline liquid made in the liver. It is stored in the gall bladder and released along the bile duct to the small intestine where it neutralises stomach acid and emulsifies fats.

What does your body do with the food you eat?




People must eat everything their cells are going to need. It is important to take in a range of different types of food molecules, and to take in enough food to supply the needs of the body.

The food we eat is made up of chunks of material containing large, insoluble molecules. Digestion is the process by which we break down these large insoluble molecules into small soluble ones that can be absorbed into the bloodstream and used in our bodies. The organs of the digestive system make chemicals such as enzymes, hydrochloric acid and bile which help us digest the food quickly and efficiently.

The human digestive system

The human digestive system

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