Topic: Cell Processes
Aim: Explain the two types of cell
transport.
Do Now: Define the term “synthesis.”
HW:Read pgs. 74-78.
Pg 74-make a foldable w/ new
vocabulary.
Pg. 78-Copy summary
Metabolism
• All life processes in
the body
• Transport,
respiration,
nutrition,
excretion,
regulation,
reproduction,
locomotion, growth,
synthesis
• Every
single living
thing
carries out
metabolic
activities
Transport
• Circulation
• Movement of materials into
and out of cells
The chloroplasts move around inside the
cell = TRANSPORT
Passive Transport
• Materials move
from high  low
concentration
• NO ENERGY
NEEDED
Weeee!!!
high
low
2 Types of Passive Transport
1. Diffusion
• Movement of
materials
from HIGH to
LOW
concentration
DIFFUSION
LOW
HIGH
• Molecules move until
concentration becomes equal on
both sides (equilibrium)
Diffusion through a
membrane
Cell membrane
Inside cell
Outside cell
Diffusion through a
membrane
Cell membrane
diffusion
Inside cell
Outside cell
Diffusion through a
membrane
Cell membrane
Inside cell
Outside cell
EQUILIBRIUM
2. Osmosis
• DIFFUSION OF WATER
• Movement of WATER from
HIGH to LOW concentration
Osmosis
Cell membrane
Inside cell
High conc. of water
molecules.
Outside cell
Low conc. of water
molecules.
Osmosis
Cell membrane
OSMOSIS
Inside cell
High conc. of water
molecules.
Outside cell
Low conc. of water
molecules.
Osmosis
Cell membrane
OSMOSIS
Inside cell
Outside cell
EQUILIBRIUM. Equal water
concentration on each side.
Active Transport
• Movement of materials from LOW
to HIGH concentration
• ENERGY IS NEEDED!
LOW
HIGH
+ energy
What happens when you place
a cell in:
1.Salt water:
• Water diffuses OUT OF CELL
70%
H2O
20%
H2O
• Animal cell: SHRINKS
Red blood cells that were placed in
a salt solution
•Plant cells: won’t shrink bc of rigid
cell wall (just the inside shrinks!!!)
Onion Cells
2. Distilled/ pure water:
• Water diffuses INTO THE CELL
70%
H2O
100%
H2O
•Animal cells = swell &
burst
• Plant cells = won’t burst bc
of cell wall
Red blood cell in distilled water
about to burst
This is gonna
be hard work!!
high
low
Let’s summarize:
1. Explain the differences between passive
transport and active transport.
2. What is the difference between diffusion and
osmosis?
3. When will diffusion stop?
4. Explain what happens to a plant cell when:
- placed in distilled water
- placed in a salt solution
5. Explain what happens to an animal cell when:
- placed in distilled water
- placed in a salt solution
Animal Cells
Same
amount of
water inside
and outside
the cell
Distilled water
Salt solution
Plant Cells
Same amount
of water
inside and
outside the
cell
Distilled water
Salt solution
Review:
Which process requires cellular
energy?
1. diffusion
2. passive transport
3. active transport
4. osmosis
Sodium ions are pumped from a region
of lower concentration to a region of
higher concentration in the nerve cells
of humans. This process is an example
of
1. diffusion
2. osmosis
3. passive transport
4. active transport
The movement of materials from
lower to higher concentration
requiring energy in the form of
ATP is called
1. movement
2. diffusion
3. active transport
4. cell division
The movement of materials from
higher to lower concentration
is called
1. diffusion
2. active transport
3. pinocytosis
4. 4. phagocytosis
If frog eggs taken from a freshwater
pond are placed in a saltwater
aquarium, what will most likely
happen?
1. Water will leave the eggs.
2. Salt will leave the eggs.
3. Water will neither enter nor leave the
eggs.
4. The eggs will burst.
Damage to which structure will most
directly disrupt water balance
within a single-celled organism?
1. ribosome
2. cell membrane
3. nucleus
4. chloroplast
When observing a microscopic view of a
maple leaf after a liquid was added to
the slide, the cell membrane seemed to
have pulled away from the cell wall.
The liquid that was added to the cells
was most likely
1. pond water
2. salt water
3. tap water
4. distilled water
The movement of water from an
area of high concentration to an
area of low concentration is
known as
1. phagocytosis
2. osmosis
3. active transport
4. pinocytosis