AQA GCSE BIOLOGY PAPER 2 EXAMS WITH
100% ACCURATE ANSWERS LATEST UPDATED
2025/2026 BEST SOLUTION RATED A+ FOR
PASS
What is homeostatsis?
The maintenance of a constant internal environment.
What is a stimulus?
A change in your environment than requires a response. e.g
Light, sound, touch, pressure, pain, chemical or temperature.
What do the receptors do?
Detect the stimulus or change in environment.
What happens after the receptors?
Receptors send messages to the CNS via the sensory neurone.
What makes up the central nervous system?
The brain or spinal cord
What is an effector?
Muscles or glands that bring about a response.
What do the muscles and glands do in response to stimuli?
Muscles contract and glands secrete chemical
substances(hormones).
,AQA GCSE BIOLOGY PAPER 2 EXAMS WITH
100% ACCURATE ANSWERS LATEST UPDATED
2025/2026 BEST SOLUTION RATED A+ FOR
PASS
What is a sensory neurone?
A neurone that carry information from the receptors to the
CNS.
What is a relay neurone?
Neurones that carry impulses from the sensory neurone to the
motor neurone.
What is a motor neurone?
Neurones that carry information from the CNS to the effectors.
What is the nervous system?
It is a system that allows you to react to your surroundings.
How do signals travel across a synapse?
The chemical or neurotransmitter diffuses across the synapse
and binds to a complementary receptor on the neurone
(postsynaptic). This causes an electrical impulse to travel down
the next neurone.
What is a synapse?
A gap between two neurones.
, AQA GCSE BIOLOGY PAPER 2 EXAMS WITH
100% ACCURATE ANSWERS LATEST UPDATED
2025/2026 BEST SOLUTION RATED A+ FOR
PASS
What is the thermoregulatory centre of the brain?
Near the hypothalamus, monitors the temperature of blood.
Describe the stages in a reflex arc.
Stimulus->Receptor->sensory neurone->CNS (relay neurone) ->
motor neurone -> effector -> response
Name responses that reduce body temperature.
Hairs lie flat, sweat and blood vessels get wider(vasodilation)
What happens during vasodilation?
The blood vessels supplying the skin dilate (widen). This helps
to transfer energy to the environment.
Name responses that increase body temperature.
Hairs stand up, no sweat, shivering and blood vessels
constrict(vasoconstriction)
What happens during vasoconstriction?
The blood vessels supplying the skin constrict to close off the
skins blood supply.
What is the body's core temp?
100% ACCURATE ANSWERS LATEST UPDATED
2025/2026 BEST SOLUTION RATED A+ FOR
PASS
What is homeostatsis?
The maintenance of a constant internal environment.
What is a stimulus?
A change in your environment than requires a response. e.g
Light, sound, touch, pressure, pain, chemical or temperature.
What do the receptors do?
Detect the stimulus or change in environment.
What happens after the receptors?
Receptors send messages to the CNS via the sensory neurone.
What makes up the central nervous system?
The brain or spinal cord
What is an effector?
Muscles or glands that bring about a response.
What do the muscles and glands do in response to stimuli?
Muscles contract and glands secrete chemical
substances(hormones).
,AQA GCSE BIOLOGY PAPER 2 EXAMS WITH
100% ACCURATE ANSWERS LATEST UPDATED
2025/2026 BEST SOLUTION RATED A+ FOR
PASS
What is a sensory neurone?
A neurone that carry information from the receptors to the
CNS.
What is a relay neurone?
Neurones that carry impulses from the sensory neurone to the
motor neurone.
What is a motor neurone?
Neurones that carry information from the CNS to the effectors.
What is the nervous system?
It is a system that allows you to react to your surroundings.
How do signals travel across a synapse?
The chemical or neurotransmitter diffuses across the synapse
and binds to a complementary receptor on the neurone
(postsynaptic). This causes an electrical impulse to travel down
the next neurone.
What is a synapse?
A gap between two neurones.
, AQA GCSE BIOLOGY PAPER 2 EXAMS WITH
100% ACCURATE ANSWERS LATEST UPDATED
2025/2026 BEST SOLUTION RATED A+ FOR
PASS
What is the thermoregulatory centre of the brain?
Near the hypothalamus, monitors the temperature of blood.
Describe the stages in a reflex arc.
Stimulus->Receptor->sensory neurone->CNS (relay neurone) ->
motor neurone -> effector -> response
Name responses that reduce body temperature.
Hairs lie flat, sweat and blood vessels get wider(vasodilation)
What happens during vasodilation?
The blood vessels supplying the skin dilate (widen). This helps
to transfer energy to the environment.
Name responses that increase body temperature.
Hairs stand up, no sweat, shivering and blood vessels
constrict(vasoconstriction)
What happens during vasoconstriction?
The blood vessels supplying the skin constrict to close off the
skins blood supply.
What is the body's core temp?
