2.5

Cell Wars

Text pages 54-56

The Big ideas• Some diseases are caused when cells are invaded by

microscopic living things• You health depends on how well your cell systems work

together

Vocabulary Words• Disease• Infection• Viruses• Pus• Antibodies• Markers

The invaders

• Disease: any condition that is harmful or interferes with normal body functions

• Infection: a cell that has been invaded• Types of invaders:– Bacteria (tetanus, strep throat, pneumonia, food

spoilage)– Fungi (athletes foot)– Protists (malaria, beaver fever)– Viruses: not true cells (colds, HIV, influenza)

The defenders

1. White blood cells, WBC (attack invader directly)– Engulf the invader and any dead body cells– Lysosomes in WBC destroy invader and dead body

cells– WBC and invader die in the process– PUS is a result (dead WBC, body cells, invaders,

protein)

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2. Antibodies

• Antibodies are made by special WBC• Made specifically to match “markers (shapes

called antigens)” on the invader• Antibodies will fit the shape/antigen and lock

onto the invader and disable it• You have 1000’s of different antibodies specific

for every invader that your mom had (via breast milk) and that you have had.