AQA GCSE COMBINED SCIENCE: TRILOGY
8464/B/2H HIGHER TIER BIOLOGY PAPER
2H 2022 FINAL TEST 2026 QUESTIONS
WITH CORRECT ANSWERS GRADED A+
◍ homeostasis.
Answer: A tendency to maintain a balanced or constant internal state; the
regulation of any aspect of body chemistry, such as blood glucose, around a
particular level
◍ nervous system.
Answer: A conglomeration of billions of cells specifically designed to
provide a communication network within the human body.
◍ receptors.
Answer: Special structures that allow living organisms to sense the
conditions of their internal or external environment
◍ stimuli.
Answer: Changes, occurring within or outside the body, that affect nervous
system functioning.
◍ coordination centres.
Answer: receive and process info from receptors
◍ effectors.
Answer: muscles or glands that carry out the correct response to stimuli
◍ nerve.
Answer: A cordlike bundle of neuronal axons and/or dendrites and
associated connective tissue coursing together outside the central nervous
system
,◍ central nervous system.
Answer: The brain and spinal cord; CNS
◍ sensory neurones.
Answer: nerve cells that carry messages from cells in the sense organs to the
CNS
◍ genome.
Answer: an entire genetic code
◍ motor neurones.
Answer: Nerve cells that carry messages from the CNS to effectors
◍ gland.
Answer: An organ that produces and releases chemicals either through ducts
or into the bloodstream.
◍ reflex.
Answer: A simple, automatic response to a sensory stimulus, such as the
knee-jerk response. Automatic and rapid; they do not involve the conscious
part of the brain.
◍ reflex arc.
Answer: nerve pathway in which an impulse crosses only two synapses
before producing a response; stimulus - receptor - sensory neurone - relay
neurone - motor neurone - effector - response
◍ neurotransmitters.
Answer: Chemical messengers that cross the synaptic gaps between neurons.
◍ relay neurones.
Answer: Nerve cells that carry signals from sensory neurones to motor
neurones
◍ gene.
Answer: a portion of DNA that codes for protien
◍ cerebral cortex.
, Answer: The part of the brain where information processing takes place.
Divided into four lobes.
◍ medulla.
Answer: The base of the brainstem; controls heartbeat and breathing.
◍ hypothalamus.
Answer: A neural structure lying below the thalamus; it directs several
maintenance activities (eating, drinking, body temperature), helps govern
the endocrine system via the pituitary gland, and is linked to emotion and
reward.
◍ pituitary gland.
Answer: The endocrine system's most influential gland. Under the influence
of the hypothalamus, it regulates growth and controls other endocrine
glands.
◍ cerebellum.
Answer: A large structure of the hindbrain that controls fine motor skills.
◍ accommodation.
Answer: The process by which the eye's lens changes shape to focus near or
far objects on the retina.
◍ iris.
Answer: A ring of muscle tissue that forms the colored portion of the eye
around the pupil and controls the size of the pupil opening.
◍ pupil.
Answer: The adjustable opening in the center of the eye through which light
enters.
◍ cornea.
Answer: Clear membrane at the front of the globe covering the iris, pupil,
and anterior chamber. Responsible for 60% of the eye's focusing power.
◍ lens.
Answer: The transparent structure behind the pupil that changes shape to
8464/B/2H HIGHER TIER BIOLOGY PAPER
2H 2022 FINAL TEST 2026 QUESTIONS
WITH CORRECT ANSWERS GRADED A+
◍ homeostasis.
Answer: A tendency to maintain a balanced or constant internal state; the
regulation of any aspect of body chemistry, such as blood glucose, around a
particular level
◍ nervous system.
Answer: A conglomeration of billions of cells specifically designed to
provide a communication network within the human body.
◍ receptors.
Answer: Special structures that allow living organisms to sense the
conditions of their internal or external environment
◍ stimuli.
Answer: Changes, occurring within or outside the body, that affect nervous
system functioning.
◍ coordination centres.
Answer: receive and process info from receptors
◍ effectors.
Answer: muscles or glands that carry out the correct response to stimuli
◍ nerve.
Answer: A cordlike bundle of neuronal axons and/or dendrites and
associated connective tissue coursing together outside the central nervous
system
,◍ central nervous system.
Answer: The brain and spinal cord; CNS
◍ sensory neurones.
Answer: nerve cells that carry messages from cells in the sense organs to the
CNS
◍ genome.
Answer: an entire genetic code
◍ motor neurones.
Answer: Nerve cells that carry messages from the CNS to effectors
◍ gland.
Answer: An organ that produces and releases chemicals either through ducts
or into the bloodstream.
◍ reflex.
Answer: A simple, automatic response to a sensory stimulus, such as the
knee-jerk response. Automatic and rapid; they do not involve the conscious
part of the brain.
◍ reflex arc.
Answer: nerve pathway in which an impulse crosses only two synapses
before producing a response; stimulus - receptor - sensory neurone - relay
neurone - motor neurone - effector - response
◍ neurotransmitters.
Answer: Chemical messengers that cross the synaptic gaps between neurons.
◍ relay neurones.
Answer: Nerve cells that carry signals from sensory neurones to motor
neurones
◍ gene.
Answer: a portion of DNA that codes for protien
◍ cerebral cortex.
, Answer: The part of the brain where information processing takes place.
Divided into four lobes.
◍ medulla.
Answer: The base of the brainstem; controls heartbeat and breathing.
◍ hypothalamus.
Answer: A neural structure lying below the thalamus; it directs several
maintenance activities (eating, drinking, body temperature), helps govern
the endocrine system via the pituitary gland, and is linked to emotion and
reward.
◍ pituitary gland.
Answer: The endocrine system's most influential gland. Under the influence
of the hypothalamus, it regulates growth and controls other endocrine
glands.
◍ cerebellum.
Answer: A large structure of the hindbrain that controls fine motor skills.
◍ accommodation.
Answer: The process by which the eye's lens changes shape to focus near or
far objects on the retina.
◍ iris.
Answer: A ring of muscle tissue that forms the colored portion of the eye
around the pupil and controls the size of the pupil opening.
◍ pupil.
Answer: The adjustable opening in the center of the eye through which light
enters.
◍ cornea.
Answer: Clear membrane at the front of the globe covering the iris, pupil,
and anterior chamber. Responsible for 60% of the eye's focusing power.
◍ lens.
Answer: The transparent structure behind the pupil that changes shape to
