Starter :

• Can you remember what an animal and a plant cell looks like?

• Can you draw and label them?

Keeping Healthy

Microbes

Would you touch this?

Would you touch this?

Would you touch this?

Would you eat this?

Why not?

• Disgust keeps us away from things which look as if they could make us ill…

• …waste like faeces, vomit, pus infected wounds, decaying food and the animals found with it.

• All these contain microbes.

Not all Microbes are bad -

Some microbes like Yeast help us bake bread

Microbes

•Fungus•Virus

•Bacterium

Fungus How is this different from a plant cell?

Give examples of where fungi will grow

Key Word : Decomposer

fungi are made of long thin threads…

when lots grow together – it looks fluffy

Bacterium

http://www.youtube.com/watch?v=gEwzDydciWc

How are bacteria different to animal cells?

• salmonella (causes food poisoning)

Are bacteria classified as living organisms?

Virus

chicken pox (affects skin and nerves) common cold influenza, flu

How do virus grow?

Is a virus a living organism?

Some can hide in your cells for years.

Cold sore viruses hide in nerve cells. They can pop out to cause an infection whenever you are feeling a bit run down.

These viruses detected a white blood cell and stuck to it. Their genes will enter it and force the cell to make new virus particles.

A virus can’t reproduce by itself.

Eventually the cell dies. Virus particles burst out through its membrane and then spread to new cells.