1. Cell membrane
TRANSPORT

2. Membrane Structure

3. Passive Transport

4. Difusion
O Small molecules like
oxygen or carbon
dioxide cross the cell
membrane. They
move towards the
side with less
concentration in
order to equal
concentrations.

5. Osmosis
O It is the movement of water across a partially
permeable membrane from an area of high water
concentration (i.e. dilute solution) to an area of low
water concentration (i.e. a concentrated solution)

6. Practice Activities
Order the following cups of water from the most
concentrated to the most diluted
a
b
c

7. Practice Activities
Draw the arrows indicating in which direction water will move:
Semipermeable
membrane

8. Active Transport
O Sometimes the cell
needs to take in
molecules that are in
a smaller
concentration in the
exterior. Therefore, in
order to introduce
them into the cell,
the cell needs to use
energy.

9. Greater particles
Endocytosis
Exocytosis

10. LAB ACTIVITY
O Objective: to observe that osmosis takes
O
O
O
O
place across the cell wall and membrane of
plant cells.
Hypothesis
Context
Materials
Procedure