1. 10.1 – Cell Growth

2. Limits to Cell Growth Why do cells need to divide?
Too much demand on its DNA (DNA overload)
As it grows it doesn’t make extra DNA (question #2)
Exchanging materials (food and oxygen in) (wastes out)
oxygen
waste
mito

3. Ratio of Surface Area to Volume in Cells
Cell Size
Surface Area (length x width x 6)
Volume
(length x width x height)
Ratio of Surface Area to Volume
Go to Section:

4. Surface Area to Volume Ratio
SA/Vol =6:10 or 3:5 10 10 10
6. As the cell grows its volume increases
much more rapidly than its surface area, therefore…
7. a. The surface area to volume ratio decreases

5. Cell Division Cell Division
8. Cell division is the process by which a cell
divides into “daughter cells”
9. Reduces the volume and increases overall surface area

6. Why does it matter? Every living cell is in contact with a capillary.
By touching the “surface” blood can deliver efficiently to
cell and also pick up wastes