Neurones

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What does the central nervous system consist of?
The brain and spinal cord
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What are the three types of neurones?
Sensory, Motor and relay
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What happens when you detect a change in environment?
The stimulus triggers your sensory neurone to carry the information from receptors to the CNS. The CNS send the information to the effector using the motor neurone.
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What is the job of the CNS?
To coordinate information
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How do reflex actions work?
The stimulus triggers your sensory neurones to carry the information from the receptors to the, spinal cord which is linked directly to the correct motor neurone which carries the information to the effector
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What are the electrical impulses passed along?
The axon
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What are the branched endings of the neurones called?
Dendrites
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What does the sheath do?
Act as and electrical insulatorthis speeds up electrical impulses and prevents signals jumping
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Why are neurones long?
It speeds up electrical impulses, connecting with other neurones slows it down.
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What is the connetion between two neurones called?
Synapse
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How do electrical impulses travle from one neurone to the next?
Electrical impulse triggers release of transmitter chemicals which diffuse across the gap. The chemicals bind with receptor molecules in the membrane of the next molecule, this sets of a new electrical impulse
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What do stimulant drugs do?
They increase the amount of transmitter chemicals at some synapses which increases the frequency of impulses
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What do depressent drugs do?
They bind with recptor molecules on the mebrane of the neurone blocking electrical impulses. This decreases brain activity.
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Card 2

Front

What are the three types of neurones?

Back

Sensory, Motor and relay

Card 3

Front

What happens when you detect a change in environment?

Back

Preview of the front of card 3

Card 4

Front

What is the job of the CNS?

Back

Preview of the front of card 4

Card 5

Front

How do reflex actions work?

Back

Preview of the front of card 5
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