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Human BiOlogy.

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elemis:
Since the blood is quite literally pouring out of the wound like a waterfall the blood doesnt get time to coagulate into a solid which would stop the bleeding.

I dont know the other questions - remember I never took Biology. This is all my general knowledge in use.

Deadly_king:

--- Quote from: iluvme on October 17, 2010, 06:19:31 pm ---Oh. Its allright. All the best for your examz.
Yupz, its OL.

--- End quote ---

Hmm.........it seems Ari has already done the job.

Anyway...........I don't have the papers. Can you give me its link ???

I can take a look if you need some explanations ;)

iluvme:

--- Quote from: Ari Ben Canaan on October 18, 2010, 05:43:27 pm ---Since the blood is quite literally pouring out of the wound like a waterfall the blood doesnt get time to coagulate into a solid which would stop the bleeding.

I dont know the other questions - remember I never took Biology. This is all my general knowledge in use.

--- End quote ---

Oh right. Thank You. :)


--- Quote from: Deadly_king on October 18, 2010, 05:44:07 pm ---Anyway...........I don't have the papers. Can you give me its link ???

--- End quote ---
Here,
http://www.xtremepapers.net/CIE/Cambridge%20O%20Levels/5096%20-%20Human%20And%20Social%20Biology/5096_w06_qp_1.pdf

Deadly_king:
3. We'll proceed by elimination since I don't think you need to know all these by heart ;)

Anopheles ----> It's a type of mosquito, like all mosquitoes, anophelines go through four stages in their life cycle: egg, larva, pupa, and imago. However it does not involve two hosts.

Mycobacterium tuberculosis ----> It's a bacteria and bacteria proliferates asexually only.

Tinea is a fungus and it reproduces by spores only which is an asexual method.

Schistosoma mansoni ----> never heard about it :P But this is the only plausible answer here.
Upon some research I found out that it has the ability to reproduce both sexually and asexually and it also involves two hosts.

--- Quote ---The life cycle is common to all species with a sexual generation in vascular system of the definitive host and an asexual generation in the intermediate hosts (snails).
--- End quote ---

Answer is C

16. At rest ---> first graph

You must number of cycles in 30s which is 6 cycles. 1 cycle represents 1dm3 of air.

Therefore in one minute, Volume of air = (6/30 x 60) = 12dm3

Apply same principle for the other graph except that in this case 1 cycle represents 2dm3

10 cycles in 30s. ----> In one minute = 2(10/30 x 60) = 40 dm3

Answer is D

24.
Part 1 is the placenta and the latter's functions is to provide the fetus with all its requirements namely nutrients, oxygen and also antibodies from the mother. However it connot prevent nicotine or alcohol from diffusing to the fetus.

Part 2 is the amniotic fluid which indeed spreads pressure evenly all around the fetus protecting it from external damage.

Part 3 is the amniotic wall which prevents the fetus from getting into direct with the internal body structures and the blood of the mother.

Part 4 is the umbilical cord which connects the fetus to the placenta across which nutrients, gases and waste products travels.

Hence answer is B

Hope it helps and am sorry for late reply :-[

iluvme:
Thank You.  :) Really helped. +rep

Anyways,

C02 reacts with lime water when blown through it to form a chalky suspension. Suggest how you could use this information to show that you produce more CO2 when you exercise than when you are at rest.

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