Energy and Activity

The energy in food is used to carry out all the activities that keep an organism alive. For example: moving, keeping warm or sensing changes in the world around it.

The more active an animal or a plant is, the more energy it needs to stay alive.

Energy is measured in Joules or sometimes in calories. The table opposite shows how much energy a man uses when he is involved in different activities. You can see from this table that the activities that need the most effort also need most energy.

• Energy in Food
• Respiration and Activity
• Energy and Starvation
• Chapter Summary (useful for revison)
• Questions relating to this chapter
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