Biology Edexcel Unit 4Watch
I haven't been on for 5 days so i'm pretty behind
But i just took my Unit 4 Biology Exam (Option A) and i wondered if ne1 else had and how it went?
We were pretty lucky... a few of my mates r @ severe risk of failing, so i've been doing a lot of last minute revision with them... and in the time it took to walk from the common room to the exam room we did parts of the brain and toxins.... guess what the first question was? Brain... And Q6?? Toxins!!
I put for D Resting, C Depolarisation, B Repolarisation. I think. It depends which way it was. Wasn't A - D right to left on the diagram? That confused me.
What did anyone put for the question as to why is there increasing volumes of urine when glucose isn't fully reabsorbed? Not sure if what I said was right or not.
The axon question i put d = resting c = depolarising and b = repolarising
I got something like 208 APs per second because it was about 4.8ms for one AP, and one second = 1000 ms. 1000ms / 4.8 comes out around 200...
Not sure about the brain as i can't remember which order they were in but i think the first blank was the cerebellum and the second was the cerebral hemispheres...