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Edexcel A-level Biology A (Salters-Nuffield) Paper 3 - 18th June 2025 [Exam Chat]

Reply 180

Asdf23

7

Original post

by Imperial Soldier

What did you guys get for the final question about the shivering rat

I put that adenosine binds to receptors in the hypothalamus, hyperpolarising the neurones and inhibiting nerve impulses that are responsible for shivering.

Reply 181

beepboop323r

5

Original post

by medic005

i say around 210

Hmm but last year was 199, fair guess but I hope it’s not above 210 🥲

Reply 182

xitz_jessix

12

Original post

by Imperial Soldier

What did you guys get for the final question about the shivering rat

Omg I remember that 😭 I was so lost
I said something about adenosine reducing neural activity so then the heat gain centre couldn’t send impulses to erector pili muscles to cause them to contract or something like that

Reply 183

xitz_jessix

12

Original post

by xitz_jessix

Omg I remember that 😭 I was so lost
I said something about adenosine reducing neural activity so then the heat gain centre couldn’t send impulses to erector pili muscles to cause them to contract or something like that

And then the previous question I talked about it an an inhibitory neurotransmitter pretty much

Reply 184

xitz_jessix

12

What did u guys this about for the question about how you could determine that T had a new mutation? Was it the fact the parents of T had to be homo recessive to not be affected and yet T had the disease (so had a dominant allele) from a mutation

Reply 185

beepboop323r

5

Original post

by xitz_jessix

Omg I remember that 😭 I was so lost
I said something about adenosine reducing neural activity so then the heat gain centre couldn’t send impulses to erector pili muscles to cause them to contract or something like that

omds same i stressed cuz i thought i was wrong- all of my q8 was done in a rush im so mad ab that - but i do feel like the last q was more about adenosine binding to receptors on hippocampus and hyper polarising it like the person above said - ig we won’t find out yet 🥲

Reply 186

xitz_jessix

12

Original post

by Asdf23

I put that adenosine binds to receptors in the hypothalamus, hyperpolarising the neurones and inhibiting nerve impulses that are responsible for shivering.

That smart 😭 sounds much more logical than what I’ve put

Reply 187

beepboop323r

5

Original post

by xitz_jessix

What did u guys this about for the question about how you could determine that T had a new mutation? Was it the fact the parents of T had to be homo recessive to not be affected and yet T had the disease (so had a dominant allele) from a mutation

yesss

Reply 188

xitz_jessix

12

Original post

by beepboop323r

omds same i stressed cuz i thought i was wrong- all of my q8 was done in a rush im so mad ab that - but i do feel like the last q was more about adenosine binding to receptors on hippocampus and hyper polarising it like the person above said - ig we won’t find out yet 🥲

Im sure it was tbh idk why I didn’t talk about hyperpilarisation 😭 I just talked about less depolarisation and less or no action potentials as a result

Reply 189

beepboop323r

5

Original post

by xitz_jessix

Im sure it was tbh idk why I didn’t talk about hyperpilarisation 😭 I just talked about less depolarisation and less or no action potentials as a result

during exams i’m so illogical sometimes it acc hurts 💔

Reply 190

xitz_jessix

12

Original post

by beepboop323r

during exams i’m so illogical sometimes it acc hurts 💔

No fr like why does my vocab and logic go out the window
It was also boiling 😭

Reply 191

beepboop323r

5

Original post

by xitz_jessix

No fr like why does my vocab and logic go out the window
It was also boiling 😭

whatever it’s over now 💔 just pray we get the grades that we want and are credited for some of the marks we messed up on🙏🏽 edexcel chem p3 to worry about next…

Reply 192

hihihihi147

6

Original post

by Asdf23

I put that adenosine binds to receptors in the hypothalamus, hyperpolarising the neurones and inhibiting nerve impulses that are responsible for shivering.

I thought it said that adenosine was reuptake so wouldn't that mean that there was less adenosine in the synapse so it couldntbind to receptors, can't depolariss, can't cause action potential, etc as opposed to hyperpolarisation

Reply 193

xitz_jessix

12

Original post

by beepboop323r

whatever it’s over now 💔 just pray we get the grades that we want and are credited for some of the marks we messed up on🙏🏽 edexcel chem p3 to worry about next…

Yeah 😭 can’t wait to mess up again 😃 (I also have theology on that day and haven’t revised it in 3 weeks and there’s 12 topics for it)

Reply 194

xitz_jessix

12

Original post

by hihihihi147

I thought it said that adenosine was reuptake so wouldn't that mean that there was less adenosine in the synapse so it couldntbind to receptors, can't depolariss, can't cause action potential, etc as opposed to hyperpolarisation

Didn’t it say that they got doses of adenosine?

Reply 195

Asdf23

7

Original post

by hihihihi147

I thought it said that adenosine was reuptake so wouldn't that mean that there was less adenosine in the synapse so it couldntbind to receptors, can't depolariss, can't cause action potential, etc as opposed to hyperpolarisation

Ohh I thought they were talking about the affect of adenosine, i didn’t realise it was the one talking about uptake. I might have confused my answers 🥲

Reply 196

hihihihi147

6

Original post

by Insouciant.

bro 💀 i actually worked it out and couldn’t get to 45

Fr I got like42or smt by actually adding them all up and then doing it idkif 42 is close enough to 45 to count

Reply 197

beepboop323r

5

Original post

by xitz_jessix

Yeah 😭 can’t wait to mess up again 😃 (I also have theology on that day and haven’t revised it in 3 weeks and there’s 12 topics for it)

good luck!! two exams in a day is wild but at least it’s the final day of a levels on friday 😭 (unless there’s some other exams idk ab)

Reply 198

hihihihi147

6

Original post

by xitz_jessix

Didn’t it say that they got doses of adenosine?

Not for the question about shivering, it said why don't they shiver when there's an uptake of adenosine I'm pretty sure I could be wrong tho

Reply 199

xitz_jessix

12

Original post

by beepboop323r

good luck!! two exams in a day is wild but at least it’s the final day of a levels on friday 😭 (unless there’s some other exams idk ab)

Goodluck as well!
Yeah I’ve already had two in one way last week but this time it’s a clash so I have to sit in isolation and I also think I’m going to be sitting the paper in a room with no others exams happening 😭

Edexcel A-level Biology A (Salters-Nuffield) Paper 3 - 18th June 2025 [Exam Chat]

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