biology paper 1 doubts

[Jevin Sanoo]

What is the difference between tissue fluid and lymph?

 

[♥Яαηõõşḧ♥]

does the bronchiole have cilia and goblet cells??

 

[Irfan1995]

does the bronchiole have cilia and goblet cells??

Bronchioles do not have any goblet cells, but all of them have cilia.

 

[Irfan1995]

What is the difference between tissue fluid and lymph?

Three main fluids:
1) Blood
2) Tissue fluid
3) Lymph

Blood leaks from capillaries to the area surrounding the cells. This forms tissue fluid which bathes the cells.
If blood kept on leaking, then there would be a build up of tissue fluid which may completely drain the blood vessels and cause a buildup or explosion of the area of the tissue fluid. So tissue fluid is returned by lymph vessels. Lymph vessels eventually return the blood to the subclavian vein near the heart and the cycle continues.

 

[Amy Bloom]

Guys, can anyone explain this to me:

 

[NouranAyman]

Peeps when they say pressure more positive that means?? like can some one explain this

 

[♥Яαηõõşḧ♥]

Bronchioles do not have any goblet cells, but all of them have cilia.

thanks

 

[Jevin Sanoo]

Three main fluids:
1) Blood
2) Tissue fluid
3) Lymph

Blood leaks from capillaries to the area surrounding the cells. This forms tissue fluid which bathes the cells.
If blood kept on leaking, then there would be a build up of tissue fluid which may completely drain the blood vessels and cause a buildup or explosion of the area of the tissue fluid. So tissue fluid is returned by lymph vessels. Lymph vessels eventually return the blood to the subclavian vein near the heart and the cycle continues.

Then what does lymph contain?

 

[Irfan1995]

Guys, can anyone explain this to me:
View attachment 18200

I answered this question already in page 2, and I'm not in the mood to type it all out again. So I'll just copy and paste it:
====================================================================================
A, B, C, and D are four different bases (adenine, guanine, cytosine, and thymine). They want to know which one is adenine.
By looking at sample 3, we can know this is a piece of RNA because it has uracil instead of thymine. This also proved to us that choice C is thymine because it is absent in RNA.
Now you just have to look at any other sample (1, 2, or 4) and find which choice is almost identical to C (since the amount of thymine is equal to that of adenine)
In sample 1, the percentage of thymine is 30%, and the closest one to that would be choice B (31%). Since B is almost identical to thymine, then B is adenine.
In sample 2, thymine is 24%, and the closest choice to that would be B (23%)
In sample 4, thymine is 33%, and the closest choice would be B (32%).

All three samples prove that base B is adenine since it is almost identical to thymine. The reason for the slight difference is experimental error.

 

[Irfan1995]

Then what does lymph contain?

Lymph has the exact same content as tissue fluid. It only has a different name because it is in a different vessel, that's all.

 

[Irfan1995]

Peeps when they say pressure more positive that means?? like can some one explain this

Could you please be a bit more specific, or point me to a certain past paper question?

 

[NouranAyman]

Guys, can anyone explain this to me:
View attachment 18200

what is the answer given in the marking scheme??

 

[Amy Bloom]

I answered this question already in page 2, and I'm not in the mood to type it all out again. So I'll just copy and paste it:
====================================================================================
A, B, C, and D are four different bases (adenine, guanine, cytosine, and thymine). They want to know which one is adenine.
By looking at sample 3, we can know this is a piece of RNA because it has uracil instead of thymine. This also proved to us that choice C is thymine because it is absent in RNA.
Now you just have to look at any other sample (1, 2, or 4) and find which choice is almost identical to C (since the amount of thymine is equal to that of adenine)
In sample 1, the percentage of thymine is 30%, and the closest one to that would be choice B (31%). Since B is almost identical to thymine, then B is adenine.
In sample 2, thymine is 24%, and the closest choice to that would be B (23%)
In sample 4, thymine is 33%, and the closest choice would be B (32%).

All three samples prove that base B is adenine since it is almost identical to thymine. The reason for the slight difference is experimental error.

Cool. thanks buddy & good luck 4tomorrow.

 

[♥Яαηõõşḧ♥]

Three main fluids:
1) Blood
2) Tissue fluid
3) Lymph

Blood leaks from capillaries to the area surrounding the cells. This forms tissue fluid which bathes the cells.
If blood kept on leaking, then there would be a build up of tissue fluid which may completely drain the blood vessels and cause a buildup or explosion of the area of the tissue fluid. So tissue fluid is returned by lymph vessels. Lymph vessels eventually return the blood to the subclavian vein near the heart and the cycle continues.

so what is the difference in composition between all three?????

 

[Amy Bloom]

what is the answer given in the marking scheme??

Answer is B. Already answered by Irfan. Thanks 4 trying^^

 

[NouranAyman]

Could you please be a bit more specific, or point me to a certain past paper question?

here you go http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_s06_qp_1.pdf Q no 17!! the answer is A can you explain

 

[Irfan1995]

so what is the difference in composition between all three?????

The three of them are nearly identical. Here are the differences:
1) Blood has red blood cells; tissue fluid and lymph do not.
2) Lymph near the small intestine (lacteals) absorb lipids from our food, so they have a lot of fats
3) Lymph near the liver has a lot of protein.

But most other lymph vessels have nearly the exact same composition as blood and tissue fluid.

 

[Irfan1995]

here you go http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_qp_1.pdf Q no 17!! the answer is A can you explain

Pressure potential actually increases the water potential, so it is positive and not negative.
The greater the pressure exerted, the higher the pressure potential.
So the more turgid a cell is, the more positive is the pressure potential (and the higher the water potential).

 

[♥Яαηõõşḧ♥]

The three of them are nearly identical. Here are the differences:
1) Blood has red blood cells; tissue fluid and lymph do not.
2) Lymph near the small intestine (lacteals) absorb lipids from our food, so they have a lot of fats
3) Lymph near the liver has a lot of protein.

But most other lymph vessels have nearly the exact same composition as blood and tissue fluid.

and does tissue fluid have protein ???

 

[NouranAyman]

Pressure potential actually increases the water potential, so it is positive and not negative.
The greater the pressure exerted, the higher the pressure potential.
So the more turgid a cell is, the more positive is the pressure potential (and the higher the water potential).

Thanks alottt and btw a higher water potential is (less negative ) right?