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Lesson 1: Cells and Infection

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1 Lesson 1: Cells and Infection
Chapter 1 Lesson 1: Cells and Infection 4th Grade Science

2 What are Cells? Cell Organism The smallest unit of living matter.
Any living thing that can carry out its life on its own.

3 Cells to Organisms Tissue Organ Organ systems
A group of similar cells that work together at the same job. Organ A group of tissues working together to do a certain job. Organ systems A group of organs that work together to do a certain job. Organelle > Cell > Tissue > Organ > Organ System > Organism

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6 What causes infection? Virus – Small things that take over cells and force them to make copies of it (The Flu) Bacteria – Small living things that cause infections (Food Poisoning) Fungus – Infection caused by fungus (Athlete’s Foot) Parasite – A living thing that invades another (Tape Worm)

7 Bacteria is everywhere
There are over a million bacteria in one cm3 of water Millions and millions of bacteria live on your body without doing any harm.


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