Download to a LOWER concentration

In a way a cell is like a miniature
version of you. It requires nutrients
and, in the process of breaking down
the nutrients, the cell produces wastes.
So there has to be a way to get
nutrients in and wastes out.
One particular part of the cell plays a
huge role in controlling what enters
and leaves the cell, so this organelle is
in charge of CELLULAR TRANSPORT.
TRANSPORT FOLDABLE
FLUID MOSAIC MODEL
FLUID
___________- because individual phospholipids
and proteins can move around freely within the
layer, like it’s a liquid.
MOSAIC
____________because its made up of many
different parts
Protein
Phospholipid
Bilayer
Animatioin from: http://www.biologycorner.com/resources/diffusion-animated.gif
Molecules move
FROM
A LOT
_______“where
there’s _______”
to
NOT
____“where
there’s _______”
DIFFUSION across a space
Happens anytime there is a
__________
DIFFERENCE in concentration in
one place compared to another
Concentration gradient
= ________________________
DIFFUSION across a SPACE
Molecules move automatically _______
DOWN
the concentration gradient _______
an
from
area of _______
Higher concentration ____
to an
area of ________
concentration
Lower
• EXAMPLES
Blue dye in beaker demo,
Someone making popcorn/grilling out
Strong perfume,
Bad smell in room
http://leighhouse.typepad.com/blog/images/kool_aid.jpg
http://www.swapmeetdave.com/Humor/Farts.htm
DIFFUSION across a space
Diffusion continues until the concentration
equal everywhere
is ________________
in space
Equilibrium
= ________________________
http://lhs.lps.org/staff/sputnam/Biology/U3Cell/diffusion_1.png
Molecules
need to
move
across
membranes
in cells
Image modiified from: http://www.accessexcellence.org/AB/GG/importProt.html
Diffusion can happen across a
membrane in a cell, too
…as long as membrane will let the molecule
pass through
_________________
CELL EXAMPLE:
DIFFUSION automatically moves oxygen
from HIGHER concentration (in lungs)
to a LOWER concentration (in blood)
CO2 automatically moves
from where there is a
HIGHER concentration
(in blood) to where there
is a lower concentration
(in lungs)
http://www.le.ac.uk/pa/teach/va/anatomy/case2/2_2.html
Fold each flap to the center
Fold
Here
Fold
Here
Position your paper this way
Cut on the dotted lines ONLY!!!!
PASSIVE TRANSPORT
(no energy)
DIFFUSION
OSMOSIS
FACILITATED
DIFFUSION
PASSIVE TRANSPORT
(no energy)
ACTIVE TRANSPORT
(energy needed)
DIFFUSION
PUMPS
OSMOSIS
ENDOCYTOSIS
FACILITATED
DIFFUSION
EXOCYTOSIS
DIFFUSION
Molecules move
From High
concentration To
Low concentration
Ex. Oxygen and
Carbon dioxide
DIFFUSION
CO2 and O2
HIGH
LOW
OSMOSIS
When WATER
moves from a
high to low
concentration
OSMOSIS
H2 O
HIGH
LOW
FACILITATED
DIFFUSION
Uses transport
proteins to move
substances
from high to low
concentration
• Ex. Glucose
or amino acids
FACILITATED DIFFUSION
Glucose
HIGH
LOW
What if cell needs to move a
AGAINST the
molecule _________
CONCENTRATION
GRADIENT?
_______________
(LOWER  HIGHER)
Cell example:
Want to put MORE glucose
into mitochondria when there is
already glucose in there
Image from: http://www.biologyclass.net/mitochondria.jpg
PUMPS
Molecules move
from LOW to HIGH
concentration.
(against the
concentration
gradient)
PUMPS
Ions
LOW
HIGH
ATP
ENDOCYTOSIS
Bulk Transport
into the cell
a. Pinocytosis
(liquids)
b. Phagocytosis
(solids)
EXOCYTOSIS
Bulk Transport
out of the cell