AQA Biology - Paper 2 2025/2026 Exam
Questions and Answers | 100% Pass
what is homeostatsis - 🧠 ANSWER ✔✔the maintenance of a constant
internal environment at optimal conditions in the body
what are the 3 parts of ay homeostatic mechanism - 🧠 ANSWER
✔✔receptors, coordination centres, effector
what is a receptor - 🧠 ANSWER ✔✔cells which detect stimuli/change in the
environment
what is an effector - 🧠 ANSWER ✔✔a muscle/gland that will bring about a
response
what do internal conditions of the body include - 🧠 ANSWER ✔✔body
temperature
the water content of the body
blood glucose concentration
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619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 1
,what are neurons found between the receptor and coordination centre
called - 🧠 ANSWER ✔✔sensory neurons (eyes, ears, skin)
what are neurons found between the effector and coordination centre
called - 🧠 ANSWER ✔✔motor neurons (brain/spinal cord)
reflex arc - 🧠 ANSWER ✔✔stimulus -> receptors -> relay neuron (in
vertebrae) -> motor neuron -> gland(hormone)/muscle(contraction)
nervous reflexes - 🧠 ANSWER ✔✔blinking, breathing, sneezing
how do synapses (gap between neurones) work - 🧠 ANSWER ✔✔nerve
impulse travels to the ed on one neurone
chemical transmitter molecules diffuse across the gap (synapse)
once they reach the receptors another electrical impulse will be generated
required practical for reaction time (catching ruler) variables - 🧠 ANSWER
✔✔Dependant variable: distance the ruler falls before being caught /
reaction time
Independent variable: age
affect of caffeine
affect of a distraction
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619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 2
,Control variables:
drop height
mass/type of rule
arm/finger position
use of dominant hand
time following caffeine intake
other ways to test reaction time - 🧠 ANSWER ✔✔computer simulated
reaction time test
what is a negative feedback loop - 🧠 ANSWER ✔✔a homeostatic
mechanism that occurs when the body detects a change and makes an
adjustment to return itself to normal
what happens if thyroxine levels increase - 🧠 ANSWER ✔✔brain send s
signals and pituitary gland releasees less thyroxine stimulating hormone
(TSH) and less thyroxine is released from the thyroid
what does less thyroxine mean - 🧠 ANSWER ✔✔lower metabolism
lower levels of protein synthesis
(and vice verse)
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 3
, why is a adrenalin released - 🧠 ANSWER ✔✔stress/scary situation
effect of adrenalin on the body - 🧠 ANSWER ✔✔pupils dilate (let more light
in to take in more visual information)
heart rate increases ( to pump blood faster to deliver more oxygen to cells)
breathing rate increases (more 02 to the blood)
glycogen reserves in muscle cells break down (to release glucose for
increased respiration)
blood from digestive systems redirected to skeletal muscles
"fight or flight"
negative feedback loop for thyroxine level - 🧠 ANSWER ✔✔1.receptors in
the brain detect an increase
2.less TSH released from the pituitary gland
3.receptors in the brain detect a decrease
4.more TSH released from the pituitary gland
graph for adrenaline production - 🧠 ANSWER ✔✔1. adrenal glands release
adrenalin (scary/stressful event)
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 4
Questions and Answers | 100% Pass
what is homeostatsis - 🧠 ANSWER ✔✔the maintenance of a constant
internal environment at optimal conditions in the body
what are the 3 parts of ay homeostatic mechanism - 🧠 ANSWER
✔✔receptors, coordination centres, effector
what is a receptor - 🧠 ANSWER ✔✔cells which detect stimuli/change in the
environment
what is an effector - 🧠 ANSWER ✔✔a muscle/gland that will bring about a
response
what do internal conditions of the body include - 🧠 ANSWER ✔✔body
temperature
the water content of the body
blood glucose concentration
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 1
,what are neurons found between the receptor and coordination centre
called - 🧠 ANSWER ✔✔sensory neurons (eyes, ears, skin)
what are neurons found between the effector and coordination centre
called - 🧠 ANSWER ✔✔motor neurons (brain/spinal cord)
reflex arc - 🧠 ANSWER ✔✔stimulus -> receptors -> relay neuron (in
vertebrae) -> motor neuron -> gland(hormone)/muscle(contraction)
nervous reflexes - 🧠 ANSWER ✔✔blinking, breathing, sneezing
how do synapses (gap between neurones) work - 🧠 ANSWER ✔✔nerve
impulse travels to the ed on one neurone
chemical transmitter molecules diffuse across the gap (synapse)
once they reach the receptors another electrical impulse will be generated
required practical for reaction time (catching ruler) variables - 🧠 ANSWER
✔✔Dependant variable: distance the ruler falls before being caught /
reaction time
Independent variable: age
affect of caffeine
affect of a distraction
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 2
,Control variables:
drop height
mass/type of rule
arm/finger position
use of dominant hand
time following caffeine intake
other ways to test reaction time - 🧠 ANSWER ✔✔computer simulated
reaction time test
what is a negative feedback loop - 🧠 ANSWER ✔✔a homeostatic
mechanism that occurs when the body detects a change and makes an
adjustment to return itself to normal
what happens if thyroxine levels increase - 🧠 ANSWER ✔✔brain send s
signals and pituitary gland releasees less thyroxine stimulating hormone
(TSH) and less thyroxine is released from the thyroid
what does less thyroxine mean - 🧠 ANSWER ✔✔lower metabolism
lower levels of protein synthesis
(and vice verse)
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 3
, why is a adrenalin released - 🧠 ANSWER ✔✔stress/scary situation
effect of adrenalin on the body - 🧠 ANSWER ✔✔pupils dilate (let more light
in to take in more visual information)
heart rate increases ( to pump blood faster to deliver more oxygen to cells)
breathing rate increases (more 02 to the blood)
glycogen reserves in muscle cells break down (to release glucose for
increased respiration)
blood from digestive systems redirected to skeletal muscles
"fight or flight"
negative feedback loop for thyroxine level - 🧠 ANSWER ✔✔1.receptors in
the brain detect an increase
2.less TSH released from the pituitary gland
3.receptors in the brain detect a decrease
4.more TSH released from the pituitary gland
graph for adrenaline production - 🧠 ANSWER ✔✔1. adrenal glands release
adrenalin (scary/stressful event)
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 4
