10.1 – Cell Growth

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

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:

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

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

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