Biology (B1): The Nervous System

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What does the nervous system control in the body?
Controls behaviour, carries electrical signals to and from the brain, allows humans to react to their environment.
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Which two areas of the body control the central nervous system?
Brain and spinal cord.
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What are stimuli?
Changes in the environment that (should) cause the human body to react.
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What are receptors?
Cells that detect stimuli.
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What is a nerve impulse?
An electrical message to the brain.
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Where does the nerve impulse travel?
Along a neurone.
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What is a neurone?
A nerve cell that carries tiny electrical signals to and from the brain.
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Why are neurones so long?
So impulses can travel quickly to and from the brain.
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Why do neurones have branched ends?
To allow connections to other branches to be made.
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Why do neurones have an insulating sheath?
To maintain the nerve impulse.
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What is a nerve?
A group of neurones connected to the central nervous system.
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Where does the sensory neurone travel/run?
From the receptor to the central nervous system.
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Where does the motor neuron travel/run?
Central nervous system to the effector.
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What is an effector?
A muscle or gland that is moved by/ is the end result of a reaction.
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What is a synapse?
Junction between nerve cells.
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What happens to the chemicals released at one end of the synapse?
They diffuse across the synapse.
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What are the receptors in the ear sensitive to?
Sound.
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What are the receptors in the eyes sensitive to?
Light.
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What are the receptors in the nose sensitive to?
Chemicals.
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What are the receptors in the mouth sensitive to?
Chemicals.
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What are the receptors in the skin sensitive to?
Changes in pressure or temperature.
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What do reflex actions prevent the body from?
Harm.
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Other cards in this set

Card 2

Front

Which two areas of the body control the central nervous system?

Back

Brain and spinal cord.

Card 3

Front

What are stimuli?

Back

Preview of the front of card 3

Card 4

Front

What are receptors?

Back

Preview of the front of card 4

Card 5

Front

What is a nerve impulse?

Back

Preview of the front of card 5
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