1. 4.2 Cell Size Key Concepts:
1 What is the relationship between cell size and its ability to transfer materials?
VOCAB/LANGUAGE
Surface to volume ratio

2. How to Calculate Cell Size Ratios
Surface Area= 6*(L*W)
Volume= L*W*H
Ratio is Surface Area/Volume

3. Let’s Calculate Cell Size
Surface Area= Ratio=
Volume=
1 cm

4. Let’s Calculate Cell Size
Surface Area= Ratio=
Volume=
2 cm

5. Let’s Calculate Cell Size
Surface Area= Ratio=
Volume=
3 cm

6. Each side has a length, width and height equal to…
CELL SIZE DATA TABLE 3
Cube A
Cube B
Cube C
Size
Each side has a length, width and height equal to…
1 cm
2 cm
3 cm
Surface Area
( cm2 )
Volume
( cm3 )
Ratio
__ : __

7. Ratios
What happens to the surface area to volume ratio as cell size increases?
Why is this important ?
Ratio Decreases
As the ratio increases, the rate of diffusion gets slower because the volume in the cell gets larger and it takes longer for the materials to travel through the cell.

8. Why is Cell size important?
What advantages does a smaller cell have in regards to…
Transporting materials? Energy Efficiencey? Time to reproduce ? Specialization ?

9. Quick Egg Lab! EGG Mass (g) Solution Type Without shell In Water
In Corn Syrup
In Salt