1. Cells and cell theory

2. What do all these things have in common?

3. Cells vs No Cells

4. Cells vs No Cells

5. Cell Theory All living things are made of cells
Cells come from other cells
Cells are the smallest unit of structure and function
Structure = how something is built
Function = how something works

6. Level of organization
When cells work together to do the same function, they form tissues
When tissues work together, they form organs
When organs work together, they form organ systems
Organ systems work together to form organisms

7. Example: levels of organization
Organization level
Example
Cell
Blood cell, skin cell, nerve cell
Tissue
Connective, Nerve, Muscular, Epithelial
Organ
Skin, stomach, heart
Organ system
Circulatory, digestive, respiratory
Organism
Human, cat, dog, plant, fungi