AQA · Biology · 8461
GCSE Biology: Structure and function
Homeostasis and response · AQA GCSE Biology (8461), specification point 4.5.2.1. Cards are generated from the exam board's own specification for "Structure and function", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What two structures make up the central nervous system (CNS)?
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The brain and the spinal cord.
Information from receptors passes along neurones as ? to the CNS.
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electrical impulses
What is the role of the CNS in a nervous response?
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It coordinates the response of effectors (muscles or glands).
Name the two types of effector in the nervous system.
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Muscles (which contract) and glands (which secrete hormones).
Nervous response pathway: stimulus → receptor → ? → effector → response.
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coordinator
Name the three types of neurone in a reflex arc.
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Sensory neurone, relay neurone and motor neurone.
Which neurone carries impulses from a receptor to the CNS?
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The sensory neurone.
Which neurone carries impulses from the CNS to an effector?
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The motor neurone.
What is the junction between two neurones in a reflex arc called?
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A synapse.
Why are reflex actions so fast?
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They are automatic and do not involve the conscious part of the brain, so no time is spent thinking about the response.
What does AQA GCSE Biology required practical 7 investigate?
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The effect of a factor on human reaction time.
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