Diffusion and osmosis LT 6.10.4 SWABT describe and compare different mechanisms of substance...
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![Page 1: Diffusion and osmosis LT 6.10.4 SWABT describe and compare different mechanisms of substance transport into and out of cells (e.g. diffusion, osmosis,](https://reader033.fdocuments.us/reader033/viewer/2022061612/56649f3a5503460f94c573ca/html5/thumbnails/1.jpg)
Diffusion and osmosis
LT 6.10.4 SWABT describe and compare different mechanisms
of substance transport into and out of cells (e.g. diffusion, osmosis, passive and active transport)
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Do gummy bears grow up?
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Have you ever bought a bag of gummy bears?
Are all gummy bears approximately the same size?
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Do gummy bears grow up?
Let’s check this out!!
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Hands on activity
• Here are your gummy bears!• Your job will be to PREDICT & OBSERVE what
happens to your gummy bears when you merge them into water
• First, make a prediction: what does it happen to the gummy bears if you put them in water?
• Then, record the weight of your gummy bear
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Possible questions
• Does the color affect what is going to happen to the gummy bear?
• Is the color going to dissolve?• Will the size of gummy bear change in water?• Make a prediction• Discuss it with your partner
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Diffusion and Osmosis
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Diffusion and Osmosis
• Passive transports: diffusion (simple & facilitated) and osmosis
• Active transport
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Materials move across membranes because of concentration differences.
Diffusion and Osmosis
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Passive transport does not require energy input from a cell.
• Molecules can move across the cell membrane through passive transport.
• There are two types of passive transport.
• osmosis
• diffusion
Diffusion and Osmosis
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Molecules move from high to low concentration
• Diffusion– move from HIGH to LOW concentration
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Diffusion• Move from HIGH to LOW concentration
– passive transport– no energy needed
diffusion
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Simple Diffusion • Move from HIGH to LOW
inside cell
outside cell
Which way will fat move?
fat
fat
fat
fat
fat
fat fat
fatfat
fat
fat
fat
fat
fat
LOW
HIGH
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Facilitated Diffusion• Move from HIGH to LOW through a channel
inside cell
outside cell
sugar
sugar
sugar
sugar
sugarsugar
sugarsugar
sugarsugar
sugar
Which way will sugar move?
sugar
sugar
LOW
HIGH
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Diffusion - Summarize• Move from HIGH to LOW concentration
– directly through membrane• simple diffusion• no energy needed
– help through a protein channel• facilitated diffusion (with help)• no energy needed HIGH
LOW
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Simple vs. facilitated diffusion
inside cell
outside cell
lipidinside cell
outside cell
H2O
simple diffusion
facilitated diffusion
H2O
protein channel
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Active transport• Cells may need molecules to move against
concentration gradient– need to pump “uphill”
• from LOW to HIGH using energy
– protein pump– requires energy
• ATP
ATP
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Transport summary
simplediffusion
facilitateddiffusion
activetransport
ATP
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Osmosis
• Movement of WATER into a region of higher solute concentration
osmosis
diffusion of water
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Osmosis (diffusion of water)
• http://www.youtube.com/watch?v=sdiJtDRJQEc
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White board
• What’s the main difference between passive and active transport?
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White board
• How many types of passive transport do you know?
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White board
• Describe the facilitated passive transport• Why is it called “facilitated” passive transport?
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White board
• What are protein channels?
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White board
• Describe active transport
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White board
• What is osmosis?
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White board
• Is osmosis a passive or active transport mechanism?
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• There are three types of solutions.
• isotonic
Diffusion and Osmosis
• hypotonic
• hypertonic
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Isotonic solution
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Hypertonic solution
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Hypotonic solution
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Keeping water balanceCell survival depends on balancing water
uptake & water loss
freshwater balanced saltwater
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J-TPS
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Can you reverse the process? How?