Download Diffusion

What will happen to the drop of dye?
Diffusion
Diffusion –
movement of a substance
from a high to a low
concentration without the
usage of energy
Diffusion is one type of
PASSIVE transport - no
energy is used by the
cell to move things
across the membrane.
Osmosis
the diffusion of water
across a semipermeable
membrane from an area of
high concentration or water
to an area of low
concentration of water
What would
happen to
this red
blood cell if
it is placed
in a salt
solution?
90% water
salt solution
70% water
Water leaves the cell
90% water
100% water
Water enters the cell
What would
happen to
this red
blood cell if
it is placed
in distilled
water?
90% water
100% water
Water enters the cell
What would
eventually
happen to
this red
blood cell if
water keeps
entering?
BOOM!!!
Isotonic solution – a solution that
contains the same concentration of
dissolved substances as a living
cell placed in it
Hypertonic solution
a solution that contains a higher
concentration of dissolved substances than
a living cell placed in it…
Hypotonic solution
a solution that contains a lower
concentration of dissolved substances…
Human cells are placed in three solutions.
Which solution is: Hypertonic? Isotonic? Hypotonic?
1. The concentration of dissolved particles are lower outside the
cell than inside the cell
hypotonic
2. The concentration of dissolved particles are higher outside the
cell than inside the cell
hypertonic
3. The concentration of dissolved particles are the same outside
the cell than inside the cell
isotonic
Hypotonic
Hypertonic
Isotonic
Label the diagrams above with the appropriate term refering to
the outside solution that the cell is placed in:
Isotonic, Hypertonic, Hypotonic
Is the environment of the cell
isotonic, hypotonic, or hypertonic?
hypotonic
isotonic
hypertonic
Hypertonic solution
Hypotonic solution
Hypotonic
Isotonic
Hypertonic
Is the environment of the cell
isotonic, hypotonic, or hypertonic?
hypotonic
isotonic
hypertonic
What can pass through the
cell membrane?
• Small particles like glucose
can pass freely through
diffusion.
High concentration
of molecules
Low concentration
of molecules
http://www.youtube.com/watch?v=iJlPaLDVvuU&NR=1
http://www.youtube.com/watch?v=503J9P49kBs&NR=1
http://www.stolaf.edu/people/giannini/flashanimat/t
ransport/osmosis.swf
http://www.youtube.com/watch?v=zFnkbOWl4z4
http://www.youtube.com/watch?feature=endscreen&v=oONjI
H39uUw&NR=1
Spanish! Start at 1:47
1
2
3
90% water
100% water
Water enters the cell
What would
happen to
this red
blood cell if
it is placed
in distilled
water?
90% water
100% water
Water enters the cell
What would
eventually
happen to
this red
blood cell if
water keeps
entering?
BOOM!!!
Where will the water move?
(into or out of the cell)
What might happen
to this cell?
90 %
water
100 %
water
What processes are occuring at
arrows A and B?
B
90 %
water
Active
transport
A
osmosis
100 %
water
Active Transport
• Movement of materials from an
area of low concentration to an area
of high concentration
• Requires energy
• Energy comes from ATP (molecule
that stores energy)
High
A
B
Low
A - diffusion
B - active transport
Why is the contractile vacuole not
needed in salt water?
90 %
water
90 %
water
Which direction (to the inside or to the outside)
would molecule move by diffusion?
Which direction would molecule
by active transport?
move
ATP
The Sodium Potassium Pump
ATP
ADP + P
protein
water
K+
What is
the
name of
this process?
Artificial cell
Pore
Beaker
diffusion
In NYS
lab, what
would the
red dots
represent?
glucose
Large molecules/substances
require energy in order for cell to
move it across the membrane =
ACTIVE transport.
phagocytosis
http://www.youtube.com/watch?v=fpOxgAU
5fFQ
http://www.youtube.com/watch?NR=1&v=a
WItglvTiLc
Pinocytosis
Active Transport
• Phagocytosis:
moving
solids into the
cell through
the cell
membrane
(reaching out)
• Pinocytosis:
moving
liquids in and
out of the cell
membrane
(pinching in)
Which process?
Phagocytosis
Which process?
Pinocytosis
Phagocytosis
2 Types of Active
Transport
•1) Endocytosis = moving
things into cell
•2) Exocytosis = moving
things out of cell
• Endocytosis: cell
membrane hugs a
substance, forms a
sac, and pulls in the
substance.
• Exocytosis: cell
forms a sac around
substance, the sac
moves to the
membrane and “spits
out” substance.
cyclosis
The circulation of cytoplasm within
certain cells and one-celled organisms.
(neither passive or active transport)
cyclosis
neither passive or active transport
• occurs inside the cell
• does not involve the cell membrane
Blue Blue
Amber
Blue/Purple
Orange/Red
Amber
1
2
3
Cytoplasm
Cell Wall
Cell Membrane
Cytoplasm
Cell Wall
Cell Membrane
Artificial cell
In NYS
lab, what
would the
red dots
represent?
glucose
Pore
Beaker
What is
the
name of
this process?
diffusion
A process that would
result in the
movement of these
molecules out of the
cell requires the use of
1. diffusion
2. energy
3. osmosis
4. cyclosis
1. What solution were these cells placed in?
1. Salt solution
2. What process is represented by the arrow?
2. Osmosis
3. What solution could be used to reverse
this process? 3. Distilled Water
The change in the appearance off the cell resulted
from more…
1. water flowing into the cell than flowing out of
the cell
2. water flowing out of the cell than flowing into
the cell
3. salt flowing into the cell than flowing out of
the cell
4. salt flowing out of the cell than flowing into
the cell
B
90 %
water
A
Active
transport
osmosis
100 %
water
Which cell is using energy for the
process shown above? Cell A
What is the name of this process?
Active Transport
Facilitated Diffusion
http://www.stolaf.edu/people/giannini/flashanimat/transport/
caryprot.swf
http://bioap.wikispaces.com/Ch+7+
Collaboration+2010
Sodium potassium pump
Indicator
Bluecolored
Glucose
Indicator
Solution
Ambercolored
Starch
Indicator
Solution
Distilled
Water
Blue
Starch
Blue
Glucose
Orange
/Red
Blue/
Amber
Amber
Purple
http://www.wisc-online.com/objects/index_tj.asp?objid=AP11203
http://www.wisc-online.com/objects/index_tj.asp?objid=AP11203
http://www.stolaf.edu/people/gia
nnini/flashanimat/transport/atpas
e.swf
• http://www.brookscole.com/chemistry_d/te
mplates/student_resources/shared_resources
/animations/ion_pump/ionpump.html