Design and Technology/Biology KS3: The science behind hydration

Olympic boxer Natasha Jones explains the importance of staying hydrated whilst training and competing to improve concentration and prevent tiredness and headaches.

We hear how the body is 60% water, and how we lose 2-3 litres a day in wee and sweat.

We hear how the sweating mechanism and thermoregulation work.

Presenter Stefan Gates uses an experiment to demonstrate the chemical composition of sweat, salts of magnesium, calcium, potassium, and sodium.

This is from the series Gastro Lab.

Teacher Notes

Students could be asked to keep a diary of how much water they drink every day for one week.

They can assess whether they drink enough and increase their rehydration during energetic activities.

Have they ever had symptoms of de-hydration (headaches, tiredness, fatigue)?

They can be asked to make a note of the ways that they might increase their fluid intake, making sure that this does not exceed the requirements or add excess sugary or fatty foods and drinks to their overall diet.

Curriculum Notes

This clip will be relevant for teaching Biology and Food Technology at Key Stage 3 in England, Wales and Northern Ireland, and 3rd Level in Scotland

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