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Science at key stage 3    (Year 9)

Unit 9B: Fit and healthy
Section 2: b. What do we mean by fit?

QCA

Objectives
Children should learn:
  • that the utilisation of energy by the body depends on several body systems
  • to represent the process of respiration by a word equation

Activities

Outcomes
Children:
  • Use secondary sources, eg video clips, slides, ICT simulations, to remind pupils how energy from food is utilised, eg in leg muscles, and how this depends on the digestive, respiratory and circulatory systems. Ask pupils to make a summary, eg by listing key points or annotating diagram(s) of the processes involved, prompting them, as appropriate, with key words and phrases. Remind pupils of the word equation for respiration.
  • describe the processes by which the energy in food is utilised in muscle
  • describe the chemical reaction through which energy is utilised

Points to note
  • This activity is designed to enable teachers to find out about pupils' knowledge and understanding of human body systems. Teachers will need to bear this in mind in later work.
  • It may be helpful to use an analogy of a machine, eg a car, to illustrate how all systems need to function well and interact if the machine is to function properly.

Sections in this unit

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This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.
1. a. What do we mean by fit?
2. b. What do we mean by fit?
3. What helps the respiratory system to function?
4. What is the effect of smoking on the lungs and other body systems?
5. a. Why is diet important?
6. b. Why is diet important?
7. How does alcohol affect the body?
8. a. What else can we do to maintain fitness?
9. b. What else can we do to maintain fitness?
10. a. What effects do drugs have?
11. b. What effects do drugs have?
12. Are we healthier than our great-grandparents were?
13. Reviewing work