6.1 osmosis and diffusion powerpoint -...
TRANSCRIPT
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Notes – 6.1
Diffusion and Osmosis
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6.1 The Structure and Func5on of the Cell Membrane
• The cell membrane has many func5ons. – protec5on – obtaining food – ridding wastes – communica5on – interac5on with other cells
A soap bubble is like a cell membrane.
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6.1 The Structure and Func5on of the Cell Membrane
• The cell membrane is made of several types of molecules.
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6.1 Diffusion • Molecules move across the cell membrane by a process called
diffusion. • Diffusion is the movement of molecules from areas of greater
concentra5on to areas of lesser concentra5on.
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6.1 Diffusion • Molecules move into or out of the cell un5l there is an equal number on both sides of the cell membrane.
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6.1 Diffusion • Water molecules are small enough to pass through the cell membrane by diffusion.
• Osmosis is the diffusion of water across the cell membrane.
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6.1 Other types of transport • Larger molecules like sugars, starches, and proteins some5mes diffuse through protein channels.
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6.1 Ac5ve transport • Ac5ve transport is a process that allows molecules to move
across the cell membrane from lower to higher concentra5ons.
• To do this requires energy.
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6.1 Other types of transport
• A cell can take in large par5cles of food by “engulfing” them.
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6.1 Why are cells so small? • To understand why the volume of a cell increases faster than its surface area, let’s imagine a perfectly square cell.
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6.1 Why are cells so small? • Which cell type has a higher volume to surface area ra5o?
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Now watch Amoeba Sisters – Osmosis & Diffusion
Do worksheet AMOEBA SISTERS: VIDEO RECAP OSMOSIS
Amoeba Sisters Video Recap of Osmosis
1. The below picture represents diffusion of molecules. Place the following labels in the diagram: high concentration, low concentration, and an arrow showing the direction that the molecules would travel before equilibrium is reached.
2. Osmosis is a type of diffusion, but it involves the movement of water. Similar to diffusion, osmosis is the movement of molecules (water molecules if osmosis) from a high concentration to a low concentration. The video clip explains that you can also look at water as moving to a __________________________________ concentration of solute molecules. Why can it also be viewed this way?
3. Osmosis Scenario: The video clip mentioned a disaster scenario of a saltwater fish being placed in fresh water. What would occur if, instead, a freshwater fish was placed in saltwater? Your answer needs to have an arrow indicating the direction of water flow in osmosis, a label for “hypertonic,” and a label for “hypotonic.”
4. Osmosis Scenario: Fluid movement into the brain after traumatic brain injury can result in dangerous brain swelling. One treatment that can be used in some of these cases is adding a ______________________________ saline. You need to decide whether this blank should be the word hypertonic or hypotonic. Remember, you are trying to reduce the excessive fluid in the brain. Explain your answer:
Time – 9:27