Active Transport
For each:
1. Identify the type of
solution
2. Describe what will
move, and where
3. Explain why this
occurs
4. Describe how the
cell’s volume will
change
1.
2.
A cell contains a solution
that is 88% water, and it is
sitting in a solution that is
20% water.
A cell contains a solution
that is 43% sugar, and it is
sitting in a solution that is
99% sugar.
Homework
Review
#12.

Distilled water has a
lower concentration of
protein than does human
blood. Imagine that Ms.
SCHERBEN is in the
hospital and she needs a
blood transfusion.
Unfortunately, the doctor
messes up and gives Ms.
SCHERBEN distilled water
instead of blood!
LOWER
H2O
Lower
protein
HIGHER
H2O
HYPOTONIC
ISOTONIC
HYPERTONIC
“LYSIS”
Goal

By the end of the period, we
can…
Compare
active and passive
transport
Identify whether cellular transport is
diffusion, active transport, or
osmosis
Passive Transport

Key Point #1: Passive transport takes no
energy and always moves towards
equilibrium.
 The
goal is equal concentration (equilibrium)
 High  Low concentration
 Happens naturally (no energy)
 Diffusion AND osmosis

In DIFFUSION
The solutes are permeable
to the membrane and move
H  L.
In OSMOSIS

Only water (solvent) is
permeable to the membrane.
75%
water
20%
water
Active Transport




Key Point #2: Active transport
takes energy to move all solutes in
or out of the cell.
The goal is to move against equilibrium
Low  High concentration
Happens on purpose (takes energy)
 Question:
What form of energy would the cell use for
active transport?
In ACTIVE
TRANSPORT

The solutes are permeable to
the membrane and move L  H
Active Transport

Why would the cell do this?
To
store food inside the cell
To eliminate wastes
To get rid of toxins
NO
ENERGY
Comparing the Three
DIFFUSION
PASSIVE
TRANSPORT OSMOSIS
ACTIVE
TRANSPORT
SOLUTES
SOLUTES
WATER
EQUILBRIUM
EQUILBRIUM
ENERGY
Helpful Hints

How can you tell if something is active or passive?
How do you know if it diffusion or osmosis?

Ask yourself:

 Is
the solute moving, or is water moving?
 What is permeable to the membrane?
 Are we moving H  L or L  H?
Guided Practice

State whether this is Active
Transport or Passive Transport
Active or Passive?
Active or Passive?
Active or Passive?

Water moving to equalize concentrations
Active or Passive?

Cell uses ATP to get as much sugar as possible
Active or Passive?

Happens naturally with no use of energy
Active or Passive?

ALL solutes being moved out of the cell
Active or Passive?

Takes energy
Active or Passive?

Moving toward equilibrium
Changing Gears

Now I will give you two cells. I will tell you what is
moving and where. You tell me if it is DIFFUSION,
OSMOSIS, OR ACTIVE TRANSPORT.
If solutes are moving from L  R
If solutes are moving from L  R
If water is moving from R  L
Water is moving from
inside  outside


A cell has a 40% sugar concentration
inside is in a solution of 50% sugar
concentration. The cell membrane is
permeable to water.
HINT: IT MIGHT HELP YOU TO DRAW
THE SITUATION
Solutes are moving from
inside  outside

A cell has a 10% sugar concentration
inside is in a solution of 50% sugar
concentration. The cell membrane is
permeable to solutes.
Solutes are moving from
outside  inside

A cell has a 10% sugar concentration
inside is in a solution of 80% sugar
concentration. The cell membrane is
permeable to solutes.
Solutes are moving from
outside  inside

A cell has a 40% sugar concentration
inside is in a solution of 20% sugar
concentration. The cell membrane is
permeable to solutes.
Independent Practice
Work INDIVIDUALLY to
complete the worksheet.


Yeaaaaaaaaahhhhh!
Key Point Wrap-Up

Key Point #1: Passive transport takes
no energy and always moves towards
equilibrium.
Both

diffusion and osmosis
Key Point #2: Active transport takes
energy to move all solutes in or out of
the cell.
Exit Question
1.
Match each of the following statements to
either ACTIVE or PASSIVE transport. (You do
not have to write complete sentences!)
 (1)
Requires energy
 (2) Movement of solute or solvent in/out of a cell
 (3) Moves toward equilibrium
2.
A cell containing 20% sugar solution is
placed in 80% sugar solution. What will
happen if ACTIVE transport occurs?