ShadowKing132
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If 3 ions are absorbed into the cell by active transport (Ion A, Ion B and Ion C).

Why for example, may Ion A be absorbed at a faster rate than Ion B?
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Lucyyy17
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(Original post by ShadowKing132)
If 3 ions are absorbed into the cell by active transport (Ion A, Ion B and Ion C).

Why for example, may Ion A be absorbed at a faster rate than Ion B?
Variation in concentration gradients and availability of transport proteins specific to ion A/B eg A absorbed faster so probably more transport proteins readily available that are specific for transporting A or the opposite, there are less transport proteins available to transport ion B so slower absorption.
Hope that helps
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ShadowKing132
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(Original post by Lucyyy17)
Variation in concentration gradients and availability of transport proteins specific to ion A/B eg A absorbed faster so probably more transport proteins readily available that are specific for transporting A or the opposite, there are less transport proteins available to transport ion B so slower absorption.
Hope that helps
Thanks sm could u help with another question?
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Lucyyy17
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(Original post by ShadowKing132)
Thanks sm could u help with another question?
Yeah sure
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ShadowKing132
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(Original post by Lucyyy17)
Yeah sure
https://imgur.com/98RU18q

Here is a diagram and graph of the experiment in the link.

a) During the experiment, the marine worm increased the volume of urine excreted. Describe how this may have influenced the mass changes of the marine worm [1].

b) The marine worm can also reduce the salt content in its body to lower the water potential so it is closer to the external solution. How does this influence mass change in the marine worm?

Thankssss
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Lucyyy17
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(Original post by ShadowKing132)
https://imgur.com/98RU18q

Here is a diagram and graph of the experiment in the link.

a) During the experiment, the marine worm increased the volume of urine excreted. Describe how this may have influenced the mass changes of the marine worm [1].

b) The marine worm can also reduce the salt content in its body to lower the water potential so it is closer to the external solution. How does this influence mass change in the marine worm?

Thankssss
A. So as the worm excreted more urine this will lead to a decrease in mass

b. Reducing the salt content so the concentration is closer to the solution will lead to less of a concentration gradient so less water moves in/ out the worm via osmosis, it keeps the mass more constant.
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ShadowKing132
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(Original post by Lucyyy17)
A. So as the worm excreted more urine this will lead to a decrease in mass

b. Reducing the salt content so the concentration is closer to the solution will lead to less of a concentration gradient so less water moves in/ out the worm via osmosis, it keeps the mass more constant.
I understand this but how do you know that the urine being excreted is the decline of the graph?

Perhaps, reducing the salt content is that part of the graph?
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Lucyyy17
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(Original post by ShadowKing132)
https://imgur.com/98RU18q

Here is a diagram and graph of the experiment in the link.

a) During the experiment, the marine worm increased the volume of urine excreted. Describe how this may have influenced the mass changes of the marine worm [1].

b) The marine worm can also reduce the salt content in its body to lower the water potential so it is closer to the external solution. How does this influence mass change in the marine worm?

Thankssss
(Original post by ShadowKing132)
I understand this but how do you know that the urine being excreted is the decline of the graph?

Perhaps, reducing the salt content is that part of the graph?
The only effect that excreting urine could have would be a decrease in mass so that would definitely be the part of the decrease. I would think that reducing the salt content would be responsible for the flat part of the graph because this is where the concentrations are similar so the movement of water will be reduced, keeping the mass of the work constant.
Hope that makes sense?
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ShadowKing132
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(Original post by Lucyyy17)
The only effect that excreting urine could have would be a decrease in mass so that would definitely be the part of the decrease. I would think that reducing the salt content would be responsible for the flat part of the graph because this is where the concentrations are similar so the movement of water will be reduced, keeping the mass of the work constant.
Hope that makes sense?
Yeah thanks a lot! I didn't know which section of the graph represented which but you have helped so thanks a lot!
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Lucyyy17
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(Original post by ShadowKing132)
Yeah thanks a lot! I didn't know which section of the graph represented which but you have helped so thanks a lot!
You’re welcome 😊
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