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Hi, How are you ?
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#2201
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#2201
(Original post by zbert)
I was wondering if anyone had a simplistic bullet point explanation of tissue fluids?
I still don't understand it
Hi, Ill try to explain it.

The heart contraction creates a pressure, which is called hydrostatic pressure.
At the arterial end of the capillary, this pressure is greater than the hydrostatic pressure outside of the capillary, and the osmotic pressure outside the capillary.
Hence, this pressure forces tissue fluid, (containing oxygen and small proteins) outside of the capillary.
Large proteins remain inside the capillary, as they are to large to pass though the cell membrane of the capillary (I think).
At the venial end of the capillary, the large proteins that remain reduces the water potential of the capillary, hence water moves into the capillary by osmosis.
The hydrostatic pressure outside the capillary is greater that inside of the capillary, hence tissue fluid (containing carbon dioxide and urea) is forced back into the capillary.
Hence, the lymphatic system collect any excess tissue fluid.

Essentially, tissue fluids is where the cells (tissue) live and allows the exchange of substances.

Hoped I helped
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laithmo96
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#2202
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#2202
Quick question, Can anyone tell me what we need to know about plants?
Thanks!
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Suzanna5678
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#2203
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#2203
No one seems to be replying to my 6 mark question about size and surface area so does this mean its unlikely to come up ???!
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HannahC1996
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#2204
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#2204
(Original post by Suzanna5678)
No one seems to be replying to my 6 mark question about size and surface area so does this mean its unlikely to come up ???!
I doubt it will come up unless we are asked about gas exchange in small organisms, but even then I wouldn't have thought that it would be a 6 marker.
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Hi, How are you ?
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#2205
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#2205
(Original post by Suzanna5678)
No one seems to be replying to my 6 mark question about size and surface area so does this mean its unlikely to come up ???!
What was your 6 mark question?
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Suzanna5678
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#2206
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#2206
(Original post by Hi, How are you ?)
What was your 6 mark question?
I'm not sure what it would be exactly but something to do with size and surface area and it relates to heat loss and stuff like that. I don't really know
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all_dolled_up
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#2207
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#2207
I think there is a good chance it will, just been revising it now, although it isn't specifically mentioned on the spec... Better safe than sorry I guess!

Edit: That was a reply to a post about a question coming up regarding the casparian strip in a plant root... Don't know why the quote didn't post...

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Nima123
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#2208
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#2208
(Original post by eddyf)
82% of 24= 19.68
Thank Youu
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rachrach12
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#2209
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#2209
Does anyone has the 2013 jan paper?
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Jimmy20002012
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#2210
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#2210
Could anyone explain the process of immunological comparisons?


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all_dolled_up
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#2211
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#2211
What actually is a dicotyledonous plant?

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madmadmax321
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#2212
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#2212
(Original post by laithmo96)
Quick question, Can anyone tell me what we need to know about plants?
Thanks!
1. gas exchange in leaves
2. structure of leaf
3. structure of chloroplasts + function of each part
4. water movement through root hair cell and cortex and up the stem
5. adaptations of xerophytes + how each adaptation helps prevent/lower amount of water loss/transpiration
6. root pressure and cohesion tension theory
7. transpiration and factors affecting it
8. how are leaves adapted to control water loss
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HannahC1996
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#2213
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#2213
(Original post by all_dolled_up)
What actually is a dicotyledonous plant?

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A plants that flowers
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ImAz
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#2214
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#2214
(Original post by Jimmy20002012)
Could anyone explain the process of immunological comparisons?


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This^


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Manni
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#2215
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#2215
Plants are a headache
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Jimmy20002012
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#2216
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#2216
What do you mean??


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laithmo96
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#2217
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#2217
(Original post by madmadmax321)
1. gas exchange in leaves
2. structure of leaf
3. structure of chloroplasts + function of each part
4. water movement through root hair cell and cortex and up the stem
5. adaptations of xerophytes + how each adaptation helps prevent/lower amount of water loss/transpiration
6. root pressure and cohesion tension theory
7. transpiration and factors affecting it
8. how are leaves adapted to control water loss
Thanks! xD
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WheezyT
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#2218
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#2218
Which page is the answers to the six markers on?! I can't find it

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oak12
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#2219
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#2219
(Original post by Suzanna5678)
I'm not sure what it would be exactly but something to do with size and surface area and it relates to heat loss and stuff like that. I don't really know

ok:

- small organism
- large surface to volume ratio
- more heat loss
- hence, has to respire more to generate heat
- so has a low affinity for oxygen
- so more oxygen is unloaded to respiring tissues for respiration
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Manni
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#2220
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#2220
Cn we not just talk about DNA hybridization?
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