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  • Nutrition, digestion and excretion

    • Structure of the digestive system

      The digestive system is made up of key parts, each of which has a different function.

    • Digestive enzymes and absorption

      Enzymes are biological catalysts which speed up reactions including digestion.

    • Food energy

      Food is a store of energy, transferred from the food to the consumer.

    • Healthy diet

      A balanced diet contains the correct amount of all food groups.

    • Malnutrition

      There are two types of malnutrition: when and how do they occur?

    • Obesity

      'Obese' is a medical term used to describe a person with a high excess of body fat.

    • Lipids, oils and fats

      Lipids include fats (solid at room temperature) and oils (liquid at room temperature).

    • Vitamins and minerals

      Vitamins and minerals help the body to use other nutrients efficiently.

    • Protein

      Proteins are a vital part of a healthy diet. Protein-rich foods include fish, meat, eggs and beans.

    • Dietary fibre

      Dietary fibre is plant material that cannot be digested by the human body.

    • Carbohydrates

      Carbohydrates are an important source of energy in a healthy diet. Starchy and sugary foods are high in carbohydrates.

    • Starch

      Starch is a type of carbohydrate. Its molecules contain carbon, hydrogen and oxygen atoms.

    • What is poo?

      Poo (faeces) is the waste that remains after food has been digested and its nutrients absorbed by the body.

    • Modelling the digestive system

      Try this experiment and recreate processes in the digestive system with online and lab options.

    • How to model digestion using tights

      Learn how digestion works and how to model digestion using a pair of tights.

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