Active Transport

Cell Transport

Active

I can… explain
the role of the
cell membrane
in maintaining
homeostasis.

2. I can… investigate
the differences
between active and
passive transport
(including facilitated
diffusion.)

I can… explain

and compare

endocytosis and

exocytosis..

LG: I am learning about
active transport across a
cell membrane.

SC:

Do Now

1. Pick Up: Grab your copies from the bin.
2. Cut: Cut out the pictures from your

copies.

3. Glue: Paste the pictures in your

notebook.

4. Write: Finish this sentence in your

notebook:
"Proteins have 3 main functions:
____________, ______________,
and ________________________."

Sponge

Demonstration

What Did you observe when the sponge
came in contact with the water?

Where did water travel? In the sponge?
Out of the sponge?

Why did water go into the sponge?

TURN & TALK

Multiple Choice

Why did water go into the sponge?

• Because the sponge is waterproof

• Because the sponge is absorbent

• Because the sponge is solid

• Because the sponge is dry

The sponge went from being low in

concentration to very high in

concentration

Multiple Choice

If a sponge goes from low concentration to high concentration, what process is it likely undergoing?

• Evaporation

• Absorption

• Freezing

• Melting

Cells are like sponges!

They control things
coming in and out based
on what they already
have.

What let’s things in and
out of the cell?

CELL MEMBRANE!

Remember: ALL cells have a cell membrane, both
prokaryotes and eukaryotes

The cell membrane controls the things
in and out of the cell!

Think of a castle,
the knights are the
“gatekeepers ” of
the castle just like a
cell membrane is the
gatekeeper of the
cell!

Multiple Choice

Which of the following cells have a cell membrane?

• 
  Prokaryotic cells

• Eukaryotic cells

• 
  Both prokaryotic and eukaryotic cells

• 
  

  Neither prokaryotic nor eukaryotic cells

Allow movement in and

out of the cell

Lipid

(hydrophobic)
Protein Channel
(carrier protein)

ATP from

Mitochondria

Cell membranes are semi permeable

Semipermeable means that some things can pass through and others
can’t.

Cells constantly move things in
and out in order to maintain
homeostasis .

Based on the image, what do
you think is the definition of
homeostasis?

TURN & TALK

Homeostasis is how living things

keep their inside conditions

balanced and steady, even when the

outside conditions change.

Multiple Choice

What do the images of the sun and a person sweating represent in the context of homeostasis?

• 
  The sun causing dehydration

• The process of photosynthesis

• 
  The need for sunscreen

• 
  The body's response to heat by sweating to maintain internal balance

Active Transport

Passive Transport

Homeostasis

Balance

Semi/Selectively

Permeable

Prokaryote

Eukaryote

What do you notice about the image

below?

TURN & TALK

This molecules transport from a low amount to a high
amount

Arrows show
Direction:
Pay attention
to the arrows.
They give
clues to the
direction the
molecules are
moving

Transport
protein: A
passage that
allows
molecules to
get through

(like a Panama
Canal)

What Does Low-to-High Concentration

Cell Transport Require?

Active TransportActive Transport

Active transport is the movement of molecules from
LOW to HIGH concentration using ATP.

- Molecules must be

pumped AGAINST
the concentration
gradient

- Energy (ATP) is

required

ATP

Energy

Against

The Role of Carrier
Proteins

What are Carrier Proteins?

● They help move things in and out

of cells.

How They Work:

● Pick up specific molecules.
● Carry them across the cell

membrane.

Why Important?

● Keep cells healthy and balanced.

Carrier Protein

Sodium-Potassium Pump

● Moves sodium (Na+) out of the cell and potassium

(K+) into the cell.

Calcium Pumps

● Transport calcium ions (Ca2+) out of the cell or

into internal storage.

Amino Acid Transporters

● Carry amino acids into the cell for protein

synthesis.

Glucose Transporters (GLUTs)

● Transport glucose into the cell for energy. They

help to maintain stable glucose levels both inside
and outside the cell.

Carrier Protein

Types of Carrier Proteins

Active

Adenosine
triphosphate
(ATP)

Against
Concentration
Gradient

Types of ACTIVE transports

- Endocytosis
- Exocytosis

Molecules
goes into

(enter) the cell

Molecules
goes out

(exit) the cell.

The cell excretes

substances.

Moving Large Molecules In and Out

Endocytosis

movement of molecules
into the cell

endo = internal
cytosis = transport
mechanism

Exocytosis

movement of molecules
out of the cell

exo = external
cytosis = transport
mechanism

Labelling

Correctly label the diagram of Active Transport

Drag labels to their correct position on the image

ATP

Sodium Pottasium Pump

Low Concentration

High Concentration

The cell membrane controls
the things that goes in and

out of the cell!

Homeostasis -
Balance/Stability

Active - Needs ATP

Endo & Exo

Activity

DOL