1. The Importance of cell division

2. How do we get from this To this 1 Cell - Zygote 2 Cells More then 100 Trillion Cells

3. We will get to that soon but first… Who Cares???? Why do we need to have cell division? What did it ever do for you? There are 3 main reasons for cell division 1)____________ 2)____________ 3)____________

4. 1) Cell Division for Reproduction -It is an important characteristic for life -____________ -Each time a cell divides it produces two new cells which can be: -____________

5. 2) Cell Division for Growth -____________ -When a multicellular organism grows it increases its number of cells -A unicellular (one cell) organism will enlarge its size slightly -____________ Cell Division Video

6. ????????????

7. Cell Division for Growth All cells need Oxygen, Water and Sugar which needs to be transferred to and through the cell ____________ Student Demonstration

8. Cell Division and Growth The movement of substances through the cell occurs by diffusion from an area of high concentration (more) to an area of low concentration ____________ Why does this impact cell size??????? Diffusion Video

9. Cell Size ____________ to get where they need to go This would cause the cell to either die from lack of nourishment (no O 2 or sugar) or from poisoning (no waste removal)

10. Cell Division for Repair ____________ Your body replaces red blood cells about every 120 days Cuts and broken bones need to be healed

11. More Cell Review http://www.forgefx.com/casestudies/prentice hall/ph/cells/cells.htm http://www.forgefx.com/casestudies/prentice hall/ph/cells/cells.htm Interactive animal and plant cells