What I don't understand is why Venules have such high cross sectional area ._.Oh lol okay great then. Thanks a lot guys. Will drop off more if I come across any.
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A level Biology: Post your doubts here!
- Thread starter XPFMember
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You're right. It's common in both C and D. One normally imagines that venules and arterioles would be similar to each other but I guess not. o_o
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Ah, yes, nice one. The only reason I got it is that cross sectional area = X. Your point about pressure holds here too. Nice.
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Here's what I think,
Arteies- Small Lumen
Veins - Larger Lumen
Capillaries - One cell thick lumen
They talk about the cross-sectional area so assume all these have the same length,
Therefore arteries will have smallest "free" area with capillaries having the highest.
then again in darks' 2nd example they've given a graph of what you suggested.CIE needs to be more careful with these things.
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Yes, this graph traumatized me since O Levels, but I did manage to get it. Thanks a lot though.
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Oh and it was taught to me by my tutor all credits to him. Else I was stuck with it too. c- closed and o-opened
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Interesting question and the only time in I guess 10 years where the word 'liposomes/liposome' occured. 
Answer is C. I hope all get this. Do ask if any question.
Answer is C. I hope all get this. Do ask if any question.
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Like cold on the inside and cold on the outside maybe I'm a liposome xD
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Living on isolation island, cherry on the top. So metal. \m/
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Good Luck guys!! sleep is necessary for focus
Absolutely man, good luck to you too hope we all ace this!!
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Good night and Sweet dreams hopefully not biology
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If anyone is still awake, answer is C. That's a pretty basic answer but A and D sound reasonable too. There is something known as penicillin allergy and D is also true and a known phenomenon. So why are they rejected? I have a couple of possible arguments but would love to hear from anyone else first.
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I actually did these two for another user on here in pm. Here is the 2015 one, stay online, I'll post the other.
10 to 50 is 40 EPG units and it also happens to be equal to 0.1 mm as both 10 and 50 coincide with the lines of the stage micrometer.
40 EPG : 0.1 mm
1 EPG = 0.1/40 = 0.0025 mm
All the round dark circles are chloroplasts. Find one that's horizontal so it's easier to measure. There's one right near the EPG scale at around 40 units. It begins at around 37 EPG units and ends at 41 EPG units, so it's about 4 EPG units.
1 EPG unit = 0.0025 nm
4 EPG units = 0.0025 x 4 = 0.010 mm
0.010 mm to micrometer is multiply it by 1000 and you get 10 micrometer. Answer should be B.