1. Cell Diversity
Cell Shape
A cell’s shape reflects its function

2. Multicellular Organization
Cells communicate and work together
Cells organize into tissues
Groups of cells that perform a similar function
Tissues organize into organs
Groups of tissues that perform a specific function
Organs organize into organ systems
Groups of organs that carry out similar functions
Organ systems organize into organisms
Groups of systems working to maintain homeostasis

3. Cellular Organization

4. Cell differentiation
Unspecialized cells develop into specific functions
Cells only use specific genes needed to carry out specific functions
Based on location of the cell in the developing embryo
Outer layer of cells become skin & nervous system
Middle layer of cells become bones & muscles
Inner layer of skin becomes organs

5. Stem Cells Body cells Divide & renew themselves for a long time
Undifferentiated
Develop into specialized cells
3 Types
Totipotent = fertilized egg can become any cell
Pluripotent = embryonic stem cell can become any cell except #1
Multipotent = adult stem cell can become a closely related cell type