In the Lab #4, part #1 Diffusion Across a Selectively Permeable Membrane activity, you studied diffusion. In the Lab #4 part 2, Osmosis Across a Selectively Permeable Membrane activity, you studied osmosis. Please create a hypothesis about the flow of solutes and solvent in two scenarios. Be sure to identify the solute and solvent in your hypothesis and explain WHY you think this will happen.
Scenario #1: The membrane is permeable to solutes.
Scenario #2: The membrane is impermeable to solutes.
In Lab #4, part 3- Tonicity in Potato Strips, you watched potatoes in varying saline (salt) solutions. Since osmosis is the movement of water across a selectively permeable membrane, how will you know If water has moved into or out of the potato cells?
In Lab #4, part 5- Red Blood Cells, what do you hypothesize will happen to the red blood cells in the following scenarios?
Isotonic solution
Hypotonic solution
Hypertonic solution
Define hemolysis & crenation and explain when each would occur in this experiment.
Explain how the kidneys use osmosis in the process of osmoregulation. Explain what happens to the body physiologically when too much salt is consumed.
We know from our previous reading and last week’s lab that the phospholipid membrane of the cell is hydrophobic. What does this mean in terms of the purpose of the phospholipid bilayer of the cell membrane?
Fish receive oxygen from water that passes through their gills. This happens by simple diffusion. What must the concentration of oxygen outside the gills be, relative to the inside of their gills for this to happen?
Are freshwater fish hypotonic, isotonic or hypertonic to their environment? Explain.
Are saltwater fish hypotonic, isotonic, or hypertonic to their environment? Explain.
People shipwrecked and stranded out in the ocean can die of dehydration, Why? There’s so much water around them. Discuss this In terms of osmosis.
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