1. Diversity of Cellular Life
Unicellular vs. Multicellular Organisms

2. Unicellular Organisms
The cell IS the organism
Protists and Bacteria
They grow, reproduce, respond to environment, and maintain homeostasis
Colonial Organisms:
“Live” together, but have no specialization

3. Multicellular Organisms
Made of many cells
Cell specialization:
Cells are specialized to perform specific functions
Cells of same type work together
Can you name some different types of cells found in humans?
Red blood cells, nerve cells, muscle cells, etc….

4. Closer look at cell specialization
Red blood cells are designed to carry oxygen
Nerve cells are designed to carry impulses
Muscle cells are designed to promote movement

5. Multicellular Organization
Organ Systems (Digestive)
Organ (Stomach)
Tissue (Smooth muscle Tissue)
Specialized cells (Muscle cell)

6. Practice Explain the levels of organization involved in touch:
Nerve cells
Brain tissue
Brain
Nervous system

7. More practice
Explain the level of organization for 1 other type of cell found in the body
Construct an analogy that also shows different levels of organization (ex. School)