OCR biology f211- 21st may 2015

Same. I'm not really disappointed because I know that any extra revision wouldn't have made much difference. The 4-8 marks I lost were simply because I didn't figure it out.

So ya gunna tell me or nah?

I might if you answer my question.

Obviously I did the paper? -___-

Hehehe Lol I talked about the squamous epithelium being thin providing a short diffusion pathway. Also, I mentioned the fact that alveoli are found in their millions in the lungs so they provide a large surface area for diffusion. I also mentioned the elastic fibres which allow more air into the alveoli and recoil to help expel air.

I see I see, pretty much same apart from elastic fibres. I guess there's a mark for QWC anyway. Was surfactant even relevant I've read that in a couple of past papers? XD XD

Yeah surfactant is good too

Could you put cambium?

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I just feel there wasn't much to distinguish between an A grade student and a C grade student, i normally do well on the harder questions and worse on the easier ones, since it was full of 'easy' questions i probably did bad haha.

I put 13 and 0.5.

What exactly did you put for this? I got many alveoli for large SA and squamous meaning it's thin so short diffusion barrier, then a mark for QWC and didn't know what else to write because it was specifically about the surface?

I put that too! Do you know if that is right?

I put lots of alveoli and folded walls for large SA, squamous and one cell thick walls for shirt diffusion distance, elastic fibres to allow the alveoli to recoil and expel air - ventilation to maintain the diffusion gradient, and also lots of capillaries on the surface of the alveoli so good blood supply maintains the diffusion gradient

Nope but I hope it is.