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Becky001
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3 years ago
For a more comfortable homework help experience, try HomeworkClinic.com.
Please, I need help witn the Review Sheet - Cell Transport.:  3, 4 and 5
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3. The following refer to Activity 3: Simulating Osmotic Pressure.

For NaCl, which MWCO membrane(s) provided for the net movement of water without movement of NaCl?

20 MWCO

Explain how you determined this. (Hint: Correlate your results to the data in Chart 3.)

Buildup of osmotic pressure due to the presence of non-diffusable NaCl in the solution causes water to diffuse down its concentration gradient.

For glucose, which MWCO membrane(s) provided for the net movement of glucose without net movement of water?

200 MWCO

Explain how you determined this.

There was no buildup of osmotic pressure, which indicates that glucose is able to diffuse down its concentration gradient.

Is osmotic pressure generated if solutes diffuse freely?

No

Explain how the solute concentration affects osmotic pressure.

The higher the solute concentration, the higher the osmotic pressure.

4. The following refer to Activity 4: Simulating Filtration.

Using your results in Chart 4, which MWCO membrane had the greatest filtration rate?

200 MWCO

Explain the relationship between pore size and filtration rate. ___________________ ___________________ ___________
Which solute did not appear in the filtrate using any of the membranes? ___________________ ___________________ ___
What is your prediction of the molecular weight of glucose compared to the other solutes in the solution? _______________
What happened when you increased the driving pressure? ___________________ ___________________ ______________
Explain why fluid flows from the capillaries of the kidneys into the kidney tubules.
How do you think a decrease in blood pressure would affect filtration in the kidneys?
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- Master of Science in Biology
- Bachelor of Science (Biology)
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Becky001
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3 years ago
Thank you Duddy!!!
Nnumber 5 is related wirh Simulating Active Transport , Could you help me with that, please.
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5. The following refer to Activity 5: Simulating Active Transport.

With 1 mMATP added to the cell interior (left beaker) and the extracellular space (right beaker), was all of the Na moved into the extracellular space? Why or why not?

No; ATP was depleted at 3 minutes.

Describe the effect of decreasing the number of sodium-potassium pumps.

The rate of active transport decreases.

Describe how you were able to show that the movement of sodium was due to active transport.

Sodium moved from the left beaker into the right beaker against its concentration gradient; there was no movement of sodium when there were no Na/K pumps added to the membrane.

You will need to contribute more to the forum before I can help you any further with PhysioEx problems
- Master of Science in Biology
- Bachelor of Science (Biology)
- Bachelor of Education
topic author
Becky001
wrote...
3 years ago
Thanks,
I am new here, and I just found this great website!! Of course I will contribute with the forum
Thanks again Duddy.   Smile
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Thanks,
I am new here, and I just found this great website!! Of course I will contribute with the forum
Thanks again Duddy.   Smile

Thanks are you're welcome Happy
- Master of Science in Biology
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topic author
qenniisiis
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3 years ago
This helped me also, thank you. Smile
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3 years ago
This really helped me. I am having trouble with the filtration part!
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3 years ago
SOME MORE EXERCISES PLEASE
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3 years ago
This really helped me. I am having trouble with the filtration part!

Please start a new topic; this one is already solved.
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3 years ago
this really helped me a lot! thanks!
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3 years ago
This website is really helpful for my physiology class, thanks to all who have been asking questions and those who have been answering questions.
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3 years ago
Here is the first section:


Simple Diffusion
The following refer to Activity 1: Simulating Dialysis (Simple Diffusion).

Which solute(s) were able to pass through the 20 MWCO membrane?
NONE

1.   According to your results, which solute had the highest molecular weight?
Albumin

2.   Which solute displayed the highest rate of diffusion through the 200 MWCO membrane?
Na+Cl

3.   Using the data from Chart 1, explain the relationship between the rate of diffusion and the size of the solute.
The larger the solute the smaller the rate of diffusion

Facilitated Diffusion
The following refer to Activity 2: Simulating Facilitated Diffusion.

4.   Did any of the substances travel against their concentration gradient? Explain why or why not.

No, because in a facilitated diffusion substance can only move down their concentration gradient
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3 years ago
This helped soo much with my physio ex test! thanx so much guys! and i love this website! you guys rock!
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