AQA GCSE Biology Paper 2
AQA GCSE Biology Paper 2 actual
solution 2024
What is homeostasis? - answer ✅✅The maintenance of a constant
internal environment.
What is a stimulus? - answer ✅✅A change in your environment
than requires a response. e.g Light, sound, touch, pressure, pain,
chemical or temperature.
What do the receptors do? - answer ✅✅Detect the stimulus or
change in environment.
What happens after the receptors? - answer ✅✅Receptors send
messages to the CNS via the sensory neurone.
What makes up the central nervous system? - answer ✅✅The brain
or spinal cord
,What is an effector? - answer ✅✅Muscles or glands that bring
about a response.
What do the muscles and glands do in response to stimuli? - answer
✅✅Muscles contract and glands secrete chemical
substances(hormones).
What is a sensory neurone? - answer ✅✅A neurone that carry
information from the receptors to the CNS.
What is a relay neurone? - answer ✅✅Neurones that carry
impulses from the sensory neurone to the motor neurone.
What is a motor neurone? - answer ✅✅Neurones that carry
information from the CNS to the effectors.
What is the nervous system? - answer ✅✅It is a system that allows
you to react to your surroundings.
How do signals travel across a synapse? - answer ✅✅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? - answer ✅✅A gap between two neurones.
,What is the thermoregulatory centre of the brain? - answer
✅✅Near the hypothalamus, monitors the temperature of blood.
Describe the stages in a reflex arc. - answer ✅✅Stimulus-
>Receptor->sensory neurone->CNS (relay neurone) -> motor
neurone -> effector -> response
Name responses that reduce body temperature. - answer ✅✅Hairs
lie flat, sweat and blood vessels get wider(vasodilation)
What happens during vasodilation? - answer ✅✅The blood vessels
supplying the skin dilate (widen). This helps to transfer energy to
the environment.
Name responses that increase body temperature. - answer
✅✅Hairs stand up, no sweat, shivering and blood vessels
constrict(vasoconstriction)
What happens during vasoconstriction? - answer ✅✅The blood
vessels supplying the skin constrict to close off the skins blood
supply.
What is the body's core temp? - answer ✅✅37 degrees Celsius
, What are hormones? - answer ✅✅Chemical messengers that travel
in the blood to target organs.
Compare and Contrast the endocrine (hormone) system and the
nervous system. - answer ✅✅Nervous is faster acting than the
endocrine system.
Hormones have longer lasting effects compared to electrical
impulses. Nerves act on a very specific area whereas hormones act
more general.
What does the thyroid gland do? - answer ✅✅Produces thyroxine
which is involved in regulating metabolism.
What do the adrenal glands do? - answer ✅✅Produce adrenaline
which is used to prepare the body for fight or flight.
What is the role of the pancreas? - answer ✅✅Produces glucagon
and insulin which are involved in regulating glucose levels in the
blood.
Name the hormone that is released if blood sugar is too high. -
answer ✅✅Insulin
What does insulin do? - answer ✅✅It makes the liver convert
glucose into glycogen. This causes blood glucose levels to decrease.
AQA GCSE Biology Paper 2 actual
solution 2024
What is homeostasis? - answer ✅✅The maintenance of a constant
internal environment.
What is a stimulus? - answer ✅✅A change in your environment
than requires a response. e.g Light, sound, touch, pressure, pain,
chemical or temperature.
What do the receptors do? - answer ✅✅Detect the stimulus or
change in environment.
What happens after the receptors? - answer ✅✅Receptors send
messages to the CNS via the sensory neurone.
What makes up the central nervous system? - answer ✅✅The brain
or spinal cord
,What is an effector? - answer ✅✅Muscles or glands that bring
about a response.
What do the muscles and glands do in response to stimuli? - answer
✅✅Muscles contract and glands secrete chemical
substances(hormones).
What is a sensory neurone? - answer ✅✅A neurone that carry
information from the receptors to the CNS.
What is a relay neurone? - answer ✅✅Neurones that carry
impulses from the sensory neurone to the motor neurone.
What is a motor neurone? - answer ✅✅Neurones that carry
information from the CNS to the effectors.
What is the nervous system? - answer ✅✅It is a system that allows
you to react to your surroundings.
How do signals travel across a synapse? - answer ✅✅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? - answer ✅✅A gap between two neurones.
,What is the thermoregulatory centre of the brain? - answer
✅✅Near the hypothalamus, monitors the temperature of blood.
Describe the stages in a reflex arc. - answer ✅✅Stimulus-
>Receptor->sensory neurone->CNS (relay neurone) -> motor
neurone -> effector -> response
Name responses that reduce body temperature. - answer ✅✅Hairs
lie flat, sweat and blood vessels get wider(vasodilation)
What happens during vasodilation? - answer ✅✅The blood vessels
supplying the skin dilate (widen). This helps to transfer energy to
the environment.
Name responses that increase body temperature. - answer
✅✅Hairs stand up, no sweat, shivering and blood vessels
constrict(vasoconstriction)
What happens during vasoconstriction? - answer ✅✅The blood
vessels supplying the skin constrict to close off the skins blood
supply.
What is the body's core temp? - answer ✅✅37 degrees Celsius
, What are hormones? - answer ✅✅Chemical messengers that travel
in the blood to target organs.
Compare and Contrast the endocrine (hormone) system and the
nervous system. - answer ✅✅Nervous is faster acting than the
endocrine system.
Hormones have longer lasting effects compared to electrical
impulses. Nerves act on a very specific area whereas hormones act
more general.
What does the thyroid gland do? - answer ✅✅Produces thyroxine
which is involved in regulating metabolism.
What do the adrenal glands do? - answer ✅✅Produce adrenaline
which is used to prepare the body for fight or flight.
What is the role of the pancreas? - answer ✅✅Produces glucagon
and insulin which are involved in regulating glucose levels in the
blood.
Name the hormone that is released if blood sugar is too high. -
answer ✅✅Insulin
What does insulin do? - answer ✅✅It makes the liver convert
glucose into glycogen. This causes blood glucose levels to decrease.
