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AQA GCSE Biology Paper 2 (Higher Combined) 8464/2H - 7th June 2024 [Exam Chat]

Reply 20

6

does anyone know whther we need to know the in detail negative feedback process for thyroxine? or just know it has a negative feedback response

Reply 21

username6464513

10

Original post

by jajahjhajhsja

does anyone know whther we need to know the in detail negative feedback process for thyroxine? or just know it has a negative feedback response

Yes I think we do. When thyroxine levels are low:
Hypothalamus produces TRH.
This causes the pituitary gland to produce TSH.
This causes the thyroid gland to produce more thyroxine.
So thyroxine levels increase and return back to normal levels.

Thyroxine stimulates the basal metabolic rate.

Reply 22

jajahjhajhsja

6

Original post

by YellowBadger2

Yes I think we do. When thyroxine levels are low:
Hypothalamus produces TRH.
This causes the pituitary gland to produce TSH.
This causes the thyroid gland to produce more thyroxine.
So thyroxine levels increase and return back to normal levels.
Thyroxine stimulates the basal metabolic rate.

thank you so much that is so helpful!

Reply 23

Es-Sk

12

Original post

by YellowBadger2

Yes I think we do. When thyroxine levels are low:
Hypothalamus produces TRH.
This causes the pituitary gland to produce TSH.
This causes the thyroid gland to produce more thyroxine.
So thyroxine levels increase and return back to normal levels.
Thyroxine stimulates the basal metabolic rate.

Tbh i dont think this will come up this year

Reply 24

jajahjhajhsja

6

Original post

by Es-Sk

Tbh i dont think this will come up this year

why not?

Reply 25

Es-Sk

12

Original post

by jajahjhajhsja

why not?

bc it came up last year.

Reply 26

jajahjhajhsja

6

Original post

by Es-Sk

bc it came up last year.

ohhh right i didn't know that

Reply 27

username6464513

10

Original post

by Es-Sk

Tbh i dont think this will come up this year

I’ve got a note of everything we need to know on paper 2, I don’t want to take any chances. Hoping for an 8-8 overall. Previous aim was 7-7 but I think I can push higher than that. Most people on here are aiming for 9-9 though so it’s a bit discouraging sometimes 😅

Reply 28

lano07xo

11

what topics is likely to come up twmr?

Reply 29

Es-Sk

12

Original post

by YellowBadger2

I’ve got a note of everything we need to know on paper 2, I don’t want to take any chances. Hoping for an 8-8 overall. Previous aim was 7-7 but I think I can push higher than that. Most people on here are aiming for 9-9 though so it’s a bit discouraging sometimes 😅

same i really need minimum of an 8-8 and i think im already on track.

Reply 30

username7009922

15

Ecology+Inheritance, Variation and Evolution are both easy topics for this paper so my revision has been focused on Homeostasis which I think is the most difficult Biology topic.