1. Structural Hierarchy in Animals

2. Cell Differentiation
The process by which a cell becomes specialized to perform a specific function.
Directed by genetic information inside the cell
An undifferentiated Cell is called a stem cell

3. Cell Differentiation
Stem Cells
Cells which can develop into different types of cells depending on which parts of DNA are switched on.

4. Stem Cells

5. Stem Cells
Embryonic Stem Cells
can differentiate into any kind of cell.
Tissue Stem Cells
only able to differentiate into certain types of cells.

6. Video
Stem Cells

7. Levels of Organization or Hierarchy in Animals
Building An Organism!
Levels of Organization or Hierarchy in Animals
Forms a pyramid with the most complex structure at the top, and least complex at the bottom

8. Organism Organ System Organ Tissue Cell

9. Tissues – a group of specialized cells which provide a specific function
ex. Epithelial tissue, connective tissue,
muscle tissue or
nerve tissue

10. Organs – a group of specialized tissues working together to perform a specific function
ex. Stomach, heart,
lungs or
muscles

11. Organ Systems – a system of one or more organs/structures that work together to perform a major vital body function
ex. Obtain and distribute oxygen and nutrients

12. Pulling It All Together

13. Thinking/Inquiry Question
Explain how 3 organ systems work together to enable you to be mobile and active.

14. Vocabulary
Stem Cells Embryonic Stem Cells Tissue Stem Cells Hierarchy Tissue Organ Organ System