Transcript CELL MEMBRANE PLASMA MEMBRANE

MOVEMENT IN AND OUT
OF A CELL
CELL MEMBRANE
PLASMA MEMBRANE
TYPES OF TRANSPORT
Active Transport
• “HIGH ENERGY”
Passive Transport
• Energy (ATP) Required
• “LAZY”
• Controlled by the cell
• No energy (ATP)
required
• Controlled by the
movement of molecules
What is DIFFUSION?
Concentration
gradient
No energy
High to low
http://www.biologycorner.com/bio1/diffusion.html
Until
Equilibrium
Is reached
http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion2.gif
What is OSMOSIS?
http://ntri.tamuk.eNot Lots
du/class/ryan/passof Water
Here
ive.html
• Diffusion of water
• Water moves from
high to low
http://www.uic.edu/classes/bios/bios100/lectures/osmosis.htm
WATER
Lots of Water Here
What is the function of
membrane?
• Homeostasis
• Controls movement of materials
in and out of cell
Do you remember what
organic molecule the
membrane is made of?
Lipids: Phospholipids
Phosphate head
Lipid
• Phospholipid Bilayer
FLUIDMOSAIC
MODEL
Outside of Cell
Inside of Cell
PASSABLE
• Monomers: amino acids,
glucose, glycerol, F.A.
• H2O, CO2, O2,
NON-PASSABLE
• Polymers: starch, proteins,
triglycerides
• charged ions (Na+, Cl-)
What happens when a cell is placed in a
solution with the same concentration as
inside the cell?
ISOTONIC SOLUTION
•The cells stay the same
size
Normal Red
Blood Cells
What happens when an animal cell is
placed in pure water?
HYPOTONIC
SOLUTION
Swollen Red
Blood Cells
•The cells swell
What happens to plants in a hypotonic
solution?
Plant cell placed in pure water?
•Will not rupture due to cell
wall
•Turgor Pressure
Video
Water
Vacuole
Contractile Vacuoles
What happens to an animal cell placed
in salt water?
HYPERTONIC
SOLULTION
Shriveled Red
Blood Cells
•The cells shrivel up
Plants in a hypertonic Solution
Plant cell placed in salt water?
•Cytoplasm and membrane
shrivel up
•Cell wall remains in place
•Plasmolysis
http://www.youtube.com/watch?v=V56Zy7uLFEA
Osmosis in an animal Cell
Osmosis in a Plant Cell
Facilitated Diffusion
• Faster with help of a
protein
• No chemical reaction
• NO ENERGY needed!
• Examples: enzymes and
glucose
Facilitated diffusion is very specific
ACTIVE TRANSPORT
What if you need to get molecules
to go against diffusion?
Against the
concentration gradient
Uses energy to “pump”
molecules in (or out)
What if the
food is too big
to fit through
the cell
membrane?
2
TYPES
ENDOCYTOSIS
PHAGOCYTOSIS
• PSEUDOPODS: false-foot
• Creates a food vacuole
• Pinocytosis: cell drinking, small particles
http://www.youtube.com/watch?v=
W6rnhiMxtKU&feature=related
• Feeding using pseudopodia (Phagocytosis)
You Tube
What is needed to digest another
cell after it is eaten?
Stores strong digestive enzymes
Lysosomes are created from the Golgi
Apparatus.
Golgi Body
http://www.sumanasinc.com/webco
ntent/animations/content/vesiclebu
dding.html
What must a cell do with undigested waste?
EXOCYTOSIS
• Cell egestion
• Removal of undigested food
• Vacuole moves to edge of cytoplasm and
opens up
• Opposite of endocytosis
• Exocytosis