7.4 cellular transport - oak park independent · 7.4 cellular transport 7.4 cellular transport...
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7.4 Cellular Transport
7.4 Cellular Transport Passive Transport· movement of molecules across a cell membrane without energy from the cell· requires NO energy· 3 types: diffusion, facilitated diffusion, osmosis
Diffusion· passive transport (NO energy needed)· molecules or ions move down their concentration gradient
high concentration to low concentrationlike sliding down a slide
· molecules continue to move until they reach equilibrium
concentration is equal and molecules move in both directions equally· example
exchange of CO2 and O2 in the lungs
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THINK: food coloring in water, OR the smell of a fart in class
Diffusion
Facilitated Diffusion· passive transport (NO energy needed)
high concentration until low concentration· diffusion with a helper· diffusion of molecules across a membrane through carrier proteins
facilitate - "to help"carrier proteins "help" molecules cross the mem.
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1 MATA: Passive transport
A does not require energy
Bmoves molecules from high to low concentration
C occurs until equilibrium is reached
D includes diffusion and osmosis
7.4 Cellular Transport
2 Facilitated diffusion
A requires energy from the cell
Bmoves molecules from low to high concentration
Cuses a protein to move molecules across the membrane
D is a type of active transport
Solute/Solvent Review
dissolved in solvent
does the dissolving
solute+
solvent
?? ?
Osmosis· passive transport (NO energy needed)· diffusion of H2O· H2O moves from high concentration to low concentration through a semipermeable membrane· water diffuses from more water to less water
Osmotic Solutions
· hypertonic - solute high, water low (outside cell) water moves out of cellcell shrivels up (crenates)
· hypotonic - solute low, water high (outside cell)water moves into cellcell can explode (cytolysis)
· isotonic - "equal strength" water moves into and out of cell equally
Water must flow from the hypo...
low solutehigh water
high solutelow water
? ? ?Water must flow from the hypo...
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Water must flow from the hypo...
7.4 Cellular Transport
Osmosis ExampleWith your BioBuddy…What will happen to a
houseplant if you water it with salt water (a hypertonic solution)?
A B CHint: Draw a Picture
3 What type of solution is this?
A isotonic
B hypotonic
C hypertonic
90% water10% salt
70% water30% salt
4 What direction will the water flow?
A out of the cell
B into the cell
Cinto and out of the cell
50% water50% sugar
50% water50% sugar
5 Osmosis is the movement of ____ through a semipermeable membrane.
Click for animations of active transport
Active Transport· requires chemical energy· molecules move up their concentration gradient
low concentration to high concentrationlike climbing up a slide or a salmon swimming up stream
· requires a transport protein· example
proton (hydrogen) pump
7.4 Cellular Transport
Endocytosis· active process (requires energy)· "endo" - inside; "cyto" - cell· bringing material into the cell
phagocytosis (cell eating) - cell mem. engulfs large particles
Exocytosis· active transport (requires energy)· "exo" - outside; "cyto" - cell· vesicles fuse with membrane to expel substances from cell· opposite of endocytosis
6 What type of transport is this?
A diffusion
Bfacilitated diffusion
C osmosis
Dactive transport
7 Active transport requires energy, moves molecules against their concentration gradient (low to high), and includes osmosis and pinocytosis.
True False