1. Cell Transport

2. Cell Transport Cell Membrane protects the cell
maintains the shape of the cell
controls what enters and leaves the cell

3. Cell Transport Semi-permeability
only lets certain materials pass through; like a strainer
Small Molecules  pass through easily
(water, oxygen, carbon dioxide)
Large Molecules  cannot pass through
(starch and proteins)

4. Cell Transport What is a cell membrane made of?
Lipids (fat) and proteins
FLUID
MOSAIC
MODEL

5. How do substances pass through a cell membrane?
Cell Transport
How do substances pass through a cell membrane?
The cell membrane is fluid (soft).
Tiny gaps form between the fat molecules and allow small substances to pass through.
The proteins act as doorways for larger molecules.

6. Two Types of Transport:
Passive Transport
Does not require energy
High concentration  Low concentration
Through gaps in lipid molecules
Generally known as diffusion
If the process involves water - osmosis
“Things will flow from high to low.”

7. Two Types of Transport:
Active Transport
Requires energy
Low concentration  High concentration
Materials pass through carrier proteins

8. Diffusion