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Cell Transport
maintaining homeostasis
Cell Membrane
___________what enters and leaves the cell
Cell membrane is surrounded by _______
Phospholipid bilayer
Cell Membrane
Lipid bilayer
Forms by itself in
water
Proteins attached
_________
_________
_____________
Diffusion in cells
When small
_______diffuse
in and out of the
cell to reach
____________
on both side of
the membrane
Passive Transport
Does _____require any _____
Happens ____________
__________ may be used in cell
membrane
Passive Transport
This type of transport moves from an area of
____ concentration to ____concentration
Diffusion
Type of ________transport
When ________ move from an area of
_____concentration to an area of
_____concentration until equilibrium is
met
Concentration
The amount of dissolved ______in
a ________
Molecules will move to an area
____ concentrated
Molecules diffuse through the cell
membrane of cells
Concentration gradient
The _______in concentration in a
solution between a cell and its
surroundings
Concentration Gradient
No gradient - ______distribution
Concentration to the ______
Increase Rate of
Diffusion
Temperature
Molecules move
______ in _______
temperatures
Pressure
Increasing pressure
also ________ rate
of diffusion
Equilibrium
This occurs when there is ____ concentration
gradient
Molecules are ______ dispersed but still
continue to move randomly
Osmosis
Diffusion of _______ across a biological
membrane
From an area of _____ concentration to _____
concentration of WATER
Osmosis in Cells
Cells are
surrounded by
water and filled
with water.
Water can move
freely through the
________
Direction of Osmosis
Osmotic Pressure
Net movement of ______
into cells
Determined by _______
concentration
Osmosis - hypertonic
______ concentration in solution
Ex: a cell in salt water
If molecules are too large to fit through cell
membrane or protein channels
______ will diffuse _____ of the cell to reach
equilibrium
Cell ______
Osmosis - hypotonic
_______ concentration in solution
Ex: a cell in pure water
If molecules are too large to fit through cell
membrane or protein channels
______ will diffuse _____ the cell to
reach equilibrium
Cell ______ - may burst!
Osmosis - Isotonic
_______ concentration in solution
If molecules are too large to fit through cell
membrane or protein channels
______ will diffuse ____ _____ _____of the
cell to maintain equilibrium
Red Onion Cells Isotonic
Red Onion Cells Hypertonic
Red Onion Cells Hypotonic
Facilitated Diffusion
When the cell membrane has ________
________ where materials are transported in
or out of cell
____ energy needed for this process
Active Transport
________ concentration gradient
From an area of ______ concentration to an
area of _____ concentration
Requires cell energy (_____) because you’re
going ________ concentration gradient
Active Transport
______ _______ embedded
in cell membrane
Gated channels
_____ energy to open
Protein changes ______
when energy is used
Sodium/Potassium Pump
Step 1: 3 Na+ ions bind to ______ ________
Step 2: ____ binds to carrier protein and
changes _______ allowing Na+ to move _____
of the cell
Step 3: 2 K+ ions move _____ carrier protein
Step 4: ____ binds to carrier protein and
changes ______ allowing K+ to move _____
the cell
Movement in Vesicles
Endocytosis - ______ the cell
Cell membrane is used to create a vesicle around
particles
Phagocytosis
________ ingestion
Pinocytosis
________ ingestion
Movement in Vesicles
Exocytosis - _____ of the cell
Vesicles created in the cell fuse with cell
membrane and release particles/liquids
Known as bulk transport