Biology- Central Nervous System
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22 Terms
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What are the 2 roles of the CNS
\-Allows humans to react to their surroundings
\-Co-ordinates their behaviour
\-Co-ordinates their behaviour
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What does a motor neurone do?
Carry nerve impulses away from CNS
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What does a relay neurone do?
Carries nerve impulses within the CNS
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What does a sensory neurone do?
Carry nerve impulses to the CNS
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What is the chain of components from a stimulus to a response?
Stimulus →Receptor →CNS →Effector → Response
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What does the cerebral cortex control?
\-Motor function
\-Decision making
\-Decision making
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What does the medulla control?
\-Reflexes/unconscious actions (breathing)
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What does the cerebrum control?
Balance
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What is A?
Cerebrum
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What is B?
Cerebellum
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What is C?
Medulla
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Why are neurons insulated by a myelin sheath?
\-To speed up impulses
\-Prevent short-circuiting
\-Prevent short-circuiting
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What is a synapse?
A gap between 2 neurones which allows chemical neurotransmitters to diffuse across the gap
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What is A?
Pre-synaptic membrane
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What is B?
Post-synaptic membrane
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What is C?
A vesicle
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What D?
Neurotransmitters
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What is a reflex action?
An automatic response to a stimulus
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What does a reflex action not involve?
The brain
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What does a reflex action do?
Protect body from harm
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How fast is a reflex action in comparison to a regular response?
Much more rapid
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What is the sequence of components in a reflex action?
Stimulus → Spinal cord → Effector → Response