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

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

Cellular Organization

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

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