Download Cell Transport14 Wiley

Cell Transport
Living Environment
Mr. Wiley
Demo #1: Vanilla Balloon
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Why can we smell the vanilla inside the balloon?
Demo #2: Food Coloring
• Record your observations as Mr. Wiley adds food
coloring to water
Demo #2: Food Coloring What is Happening?
Demo #3: Air Freshener
Record your observations as Mr. Wiley sprays
perfume in one spot in the room.
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Classroom
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In all of these demonstrations…
We started with a LOT of molecules in one place
We call this: High Concentration
In areas with little to no molecules
We call this: Low Concentration
When there is a High Concentration and low concentration
next to each other we call it a: Concentration Gradient
Transport
The life function that involves the
absorption and circulation of
materials throughout an organism.
Circulation
What do you think of hear when you hear the term circulation?
Definition- the movement of materials throughout
a cell and/or a multi-cellular organism.
Absorption
What do you think of hear when you hear the term absorption?
Definition- the process by which digested and
dissolved materials enters the cell(s) of an
organism.
Two main types of transport:
1. Passive Transport
• Diffusion
• Osmosis
• Facilitated Diffusion
2. Active Transport
What does it mean to be passive?
What are the types of transport?
1. Diffusion – movement of molecules from an
area of high concentration to low concentration
(High  Low)
• NO ENERGY is required!
• Small molecules
• Ex: Glucose (small sugar), Amino Acids
• Occurs across lipid bi-layer
Why Diffusion does NOT require energy:
What factors influence diffusion?
• Temperature
• Pressure
• Number of molecules inside &
outside cell (Concentration Gradient)
• Size of the molecules
2. Osmosis - specific kind of
diffusion – only movement of
WATER molecules into and out of
the cell (High  Low)
• NO ENERGY required
• Water Molecules
• Hint: H2Osmosis!
• Occurs across lipid bi-layer
Tonicity
Tonicity- the amount of water and solute in a cell/solution
Iso- Same
Hypo- Less, Low
Hyper- More, A lot
• Isotonic solution- a solution that has the same concentration of
dissolved substances and water molecules as the inside of the cell.
• Hypotonic solution- a solution that has a lower concentration of
dissolved substances and a higher concentration of water
molecules, than the cell.
• Hypertonic solution- a solution that has a higher concentration of
dissolved substances and a lower concentration of water
molecules, than the cell.
Tonicity
Hypotonic
Cell
70% H2o
100%
H2O
Cell Swells, Grows
https://www.youtube.com/watch?v=OYoaLzobQ
mk
Hypertonic
Cell
70% H2o
50%
H2O
Cell Shrinks
https://www.youtube.com/watch?v=gWkcFU-hHUk
Isotonic
Cell
70% H2o
70%
H2O
Cell Remains
the same
Your teacher facilitates while you complete your labs.
A coach facilitates a sports game.
A parent facilitates a toddler brushing his teeth.
What does it mean to facilitate?
3. Facilitated Diffusion – the movement of larger
molecules from high to low concentration using
transmembrane proteins as “helpers”.
•NO ENERGY required
•Occurs through proteins
•EX: minerals
What does it mean to be “active?”
(include your own definition & examples)
Using what you know about diffusion,
predict what Active Transport means.
4. Active Transport – movement across the cell
membrane from LOW to HIGH concentration
• Goes against concentration gradient (low to high)
• Requires Energy (ATP)!
• Occurs across Transmembrane protein
https://www.youtube.com/watch?v=STzOiRqzzL4
Why Active Transport requires energy:
Putting it all together
Passive Transport
Active Transport
Putting it all together:
1. Create a concentration gradient: high concentration
outside of cell; low concentration inside cell
2. Draw diffusion, facilitated diffusion, and active transport
occurring. Label the arrows.
3. What would osmosis look like?
Funny Active Transport Video
Exocytosis in Paramecium
• https://www.youtube.com/watch?v=U9pvm_4-bHg