Four processes, one body
Show on a big screenEven when you sleep, your body is at work. It keeps repairing itself.
- One connected chain, four boxes.
- Nutrition: food comes in.
- Respiration: energy is released.
- Transport: food and oxygen are carried around.
- Excretion: waste leaves the body.
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Read each event. Tap the life process it belongs to.
The rule
The jobs that keep a body working are life processes. Living things need outside energy to repair themselves. They need raw materials to grow.
Life processes keep a body in repair. Nutrition brings in food. Respiration releases the food’s energy. Transport carries things around. Excretion removes harmful wastes.
| Process | What it does |
|---|---|
| Nutrition | Brings food into the body |
| Respiration | Releases energy from food |
| Transport | Carries food, oxygen and wastes |
| Excretion | Removes harmful wastes |
In a tiny one-celled living thing, the whole surface touches the surroundings. In a large body, most cells do not. Diffusion is the slow spreading of a substance. It moves from where there is more to where there is less. Diffusion is too slow to supply those inner cells. So large bodies need transport.
Try the lab to finish this lesson.