What is this a picture of?
The cell membrane
Facilitated diffusion requires a ___________
___________to move molecules from high to
low concentration
Facilitated diffusion requires a Transport Protein
to move molecules from high to low
concentration
The cell membrane is _______ _______.
This means….
Some molecules can pass
through and some molecules
can’t
The membrane is “selective”
The cell membrane is semi-permeable
• A membrane that allows
certain molecules to pass
through it by diffusion or
osmosis
• Think about a Ping-Pong
net..
• Which would pass
through?
*Is a type of passive transport
• Doesn’t require energy
• Uses transport proteins to
move molecules from high to
low concentration
8
Facilitated Diffusion
*Is a type of passive transport
• Doesn’t require energy
• Uses transport proteins to
move molecules from high to
low concentration
9
Which type of active transport…
• Moves AGAINST the
concentration gradient
• Low solute
concentration to high
solute concentration
• The cell uses energy
(ATP) to actively
transport Na+ out of the
cell and K+ into the cell
against the
concentration gradient
Sodium Potassium Pump
What I need to know
• Active transport
goes AGAINST the
concentration
gradient
• Low solute
concentration to
high solute
concentration
Which type of active transport….
Transports material into a
cell by the in folding of a
membrane.
Think enter
To take inside of the cell
Endocytosis
Transporting material into a
cell by the in folding of a
membrane.
Think endoThink enter
To take inside of the cell
During which type of endocytosis
solid particles are ingested into the
cell…
2 Types of Endocytosis
1.) Phagocytosis- Solid
particles are ingested into
the cell.
In which type of endocytosis are
liquids and very small molecules
taken into the cell.
Types of Endocytosis
2.) Pinocytosis – liquids
and very small molecules
are taken into the cell.
___________is defined as…
The movement of particles from areas of high solute
concentration to areas of low solute concentration
(down the concentration gradient)
Diffusion defined as…
The movement of particles from areas of high solute
concentration to areas of low solute concentration
(down the concentration gradient)
In order to maintain ___________ your body
sweats when you are hot and shivers/ you get
goose bumps when you are cold.
In order to maintain homeostasis your body
sweats when you are hot and shivers/ you get
goose bumps when you are cold.
Who am I?
I am found in animal cell membrane
and effect fluidity (how easily the
structure can move) depending on
temperature. I also strengthen the
cell membrane.
Cholesterol
I am found in animal cell membrane
and effect fluidity (how easily the
structure can move) depending on
temperature. I also strengthen the cell
membrane.
Cell Membrane
Phosphate head
WATER
Fatty acid tail
• Nonpolar fatty acid tails are __________ or
“water fearing”
Cell Membrane
Hydrophilic
head
WATER
Hydrophobic
tail
• Nonpolar tails are hydrophobic or “water
fearing”
Which type of cellular transport….
REQUIRES ENERGY (ATP)?
Types of Cellular Transport
How “stuff” gets into and outside of the cell membrane
 Active Transport
cell USES ENERGY (ATP)!!
1. Protein Pumps
2. Endocytosis
3. Exocytosis
Is the solution below isotonic,
hypertonic, or hypotonic?
15% NaCL
85% H2O
ENVIRONMENT
CELL
5% NaCL
95% H2O
What is the direction of water movement?
28
Solution is Hypertonic Solution
15% NaCL
85% H2O
ENVIRONMENT
In a hypertonic
solution there is
MORE SOLUTE in
the solution that in
the cell
CELL
5% NaCL
95% H2O
The cell is HYPOTONIC and the solution is HYPERTONIC
29
Who am I?
I am composed of three basic parts: a charged
phosphate group and glycerol “head”, and two
fatty acid chains “tail”.
Phospholipid
• I am composed of three basic parts: a charged
phosphate group and glycerol “head”, and two
fatty acid chains “tail”.
Who am I?
• I am a protein that is not embedded and is
loosely attached to the surface of the cell
membrane.
Peripheral Protein
• I am a protein that is not embedded and is
loosely attached to the surface of the cell
membrane.
Identify the structure in the picture
labeled A
Identify the structure in the picture
labeled A
Phospholipid bilayer
Which type of active
transport…
• Moves materials
out of the cell
Molecules are moved out of the cell by
vesicles that fuse with the plasma membrane.
Moving the “Big Stuff”
Exocytosismoving
things out.
Molecules are moved out of the cell by vesicles that fuse with the
plasma membrane.
This is how many hormones are secreted and how nerve cells
communicate with one another.
37
Identify the structure in the picture
labeled B
Identify the structure in the picture
labeled B
Integral protein
Cell Membrane
Phosphate head
WATER
Fatty acid tail
• Polar heads are __________ or “water
loving”
Cell Membrane
Phosphate head
WATER
Fatty acid tail
• Polar heads are hydrophilic or “water loving”
The difference in concentration of
dissolved particles from one location
to another is called what?
A. Simple Diffusion
B. Dynamic gradient
C. Concentration gradient
D. Dynamic Equilibrium
The difference in concentration of
dissolved particles from one location
to another is called what?
A. Simple Diffusion
B. Dynamic gradient
C. Concentration gradient
D. Dynamic Equilibrium
Which type of transport is describe below?
• Diffusion that involves water.
• Movement of water across a semi-permeable
membrane
• WATER moves across the cell membrane
• Water moves across the cell membrane from areas
of low solute concentration to high solute
concentration
Osmosis!
• Diffusion that involves water.
• Movement of water across a semi-permeable
membrane
• WATER moves across the cell membrane
• Water moves across the cell membrane from areas
of low solute concentration to high solute
concentration
Is the solution below isotonic,
hypertonic, or hypotonic?
Solution
10% NaCL
90% H2O
CELL
10% NaCL
90% H2O
cell is
at _______________.
WhatThe
is the
direction
of water movement?
46
Solution is Isotonic Solution
ENVIRONMENT
10% NaCL
90% H2O
CELL
10% NaCL
90% H2O
equilibrium
cell is
at _______________.
WhatThe
is the
direction
of water movement?
NO NET
MOVEMENT
47
Is the solution below isotonic,
hypertonic, or hypotonic?
10% NaCL
90% H2O
CELL
20% NaCL
80% H2O
48
Solution is Hypotonic Solution
10% NaCL
90% H2O
CELL
In a hypotonic
solution there is
MORE SOLUTE in
the cell than in the
solution
20% NaCL
80% H2O
The cell is HYPERTONIC and the solution is HYPOTONIC
49
Which type of cellular transport….
does NOT USE ENERGY?
Types of Cellular Transport
How “stuff” gets into and outside of the cell membrane
 Passive Transport
cell does NOT USE ENERGY
1. Diffusion
2. Facilitated Diffusion
3. Osmosis