What pen are you using ??name of that pen please?? It works so neat.
@byuphysiologylab2551
4 жыл бұрын
It's just a Sharpe!
@jehanzeb_q9403
2 жыл бұрын
in question no 3,urea is a penetrating solute,it should not effect tonicity but you have concluded the outside to be hypotonoic.someone plz explain.
@byuphysiologylab2551
2 жыл бұрын
Great question. If you go back and review the LPA 1B video, it explains that “tonicity” is a way to describe how a cell reacts when placed in a solution. If the cell in this example were to be placed in a solution with non-penetrable solutes, the solution would be HYPER-tonic because water would flow out of the cell into the hyperosmotic solution. However, because urea can penetrate the cell wall, it will enter the cell down its concentration gradient, bringing water with it. This will cause the cell to expand. The expanding reaction of the cell when being placed in the solution makes the solution hypotonic. Theoretically, over time the urea could reach an equilibrium but the gradient is so large in the example given in this video, that the cell would likely expand and lyse before having the opportunity to reach equilibrium. Here is the link to an article that may be helpful in explaining this concept further: journals.physiology.org/doi/full/10.1152/advan.00083.2016
@jehanzeb_q9403
2 жыл бұрын
@@byuphysiologylab2551 thank you so much. The article and your explanation helped alot
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