AQA Biology Unit 1 January A-S 2012 *EXAM FINISHED*

Firstly smoking causes the irreversible change of red blood cells- the haemoglobin combines with carbon monoxide to form carboxyhaemoglobin as opposed to oxyhaemobglobin. This results in a decrease in the carrying capacity of red blood cells and so the heart must work harder to deliver sufficient oxygen. This raises the blood pressure which causes
a)artery walls to harden restricting blood flow
b)heart to be more prone to failure (work faster/harder)
c) Increase likelihood of aneurysm.
These all cause increased risk of C.H.D
Nicotine causes stimulation of adrenaline production which raises blood pressure also.

Hahah.. I still can't figure out who heis Its been narrowed down to 4 people though! :P

no comment .... need to find out who you are 1st.. lol

Hahahah. It feels like that ;D

Anyway, how are you feeling about the exam?

mockinggggbirdddd can you please confirm something pleaseee..

the last question of the jan 2011 paper asks about empysema. however, the first mark is awarded for saying

Alveoli break down / collapse / rupture / walls
thicken;

why is walls thicken on the mark scheme when emphysema is not related to the thickening of the walls, but instead pulmonary fibrosis is the disease that talks about the thickening of the walls ??

Hahahah. It feels like that ;D

Anyway, how are you feeling about the exam?

sorry but isnt this a biology thread? lets focus on the biology considering its in a couple of days?

Thats so a yes! I know who you are >:] Who is it you think I am.. with some way of describing.. hahah.

wth... we never even did that in biology

sorry but isnt this a biology thread? lets focus on the biology considering its in a couple of days?

I can't remember exactly what the mark scheme says but.. Is it not relating to alveolar wall thickens hence increased diffusion pathway ? Or is that a different mark?
If there isnt a different mark for it i'd presume thats what it meant

1. I know its too late to get an A, so i ant assed about it any more.
2. i only got my self 2 blame 4 sitting on my ass
3. if i dont hit my targets there is always june
4. so i guess im confident that im prob. gone end uo getting a D - C however i did a past paper last night and got an A grade so im confused too...
5. im a complicated guy with a complicated mind lmfao.....
6. what ever happens our fates are already written, but we can try 2 change it... but if i do try now its not gone do much might jus get me like 5 marks more???...

Firstly smoking causes the irreversible change of red blood cells- the haemoglobin combines with carbon monoxide to form carboxyhaemoglobin as opposed to oxyhaemobglobin. This results in a decrease in the carrying capacity of red blood cells and so the heart must work harder to deliver sufficient oxygen. This raises the blood pressure which causes
a)artery walls to harden restricting blood flow
b)heart to be more prone to failure (work faster/harder)
c) Increase likelihood of aneurysm.
These all cause increased risk of C.H.D
Nicotine causes stimulation of adrenaline production which raises blood pressure also.

1. I know its too late to get an A, so i ant assed about it any more.
2. i only got my self 2 blame 4 sitting on my ass
3. if i dont hit my targets there is always june
4. so i guess im confident that im prob. gone end uo getting a D - C however i did a past paper last night and got an A grade so im confused too...
5. im a complicated guy with a complicated mind lmfao.....
6. what ever happens our fates are already written, but we can try 2 change it... but if i do try now its not gone do much might jus get me like 5 marks more???...

Do you have a question or are you just being like that for no reason? :3

I can't remember exactly what the mark scheme says but.. Is it not relating to alveolar wall thickens hence increased diffusion pathway ? Or is that a different mark?
If there isnt a different mark for it i'd presume thats what it meant

im reading through the thread and its all really useful so thankyou but the random conversations are a bit unnecessary :/ sorry im just very stressed, yet to get above a d in the past papers

LOL..come on a bit later when the questions start! Good luck for the exam though

the question is:

Emphysema is another disease of the lungs. People with emphysema may feel
weak and tired. Explain why

the ms is:


1 Alveoli break down / collapse / rupture / walls
thicken;
2 Less surface area / increases diffusion distance /
less diffusion;
3 Loss of elastin / elastic tissue / elastase involved;
4 (Alveoli / lungs) cannot recoil / spring back / have
reduced elasticity / more difficult to expel air;
5 Reduced diffusion gradient / air not replenished /
less air leaves lungs;
6 Less oxygen enters blood / tissues;
7 Less respiration / less energy released / less ATP
produced

im really rattled by this question