Sensory and motor neurones

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  • Created by: Steff06
  • Created on: 17-05-16 10:26
What are the 3 different types of neurone?
Sensory neurones, motor neurones, relay neurones.
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What do sensory neurones do?
Carry the action potential from a sensory receptor to the central nervous system (CNS).
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What do motor neurones do?
Carry an action potential from the CNS to an effector such as a muscle or gland.
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What do relay neurones do?
Connect sensory and motor neurones.
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What is the function of the neurone?
To transmit the action potential from one part of the body to another.
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How does the length of a neurone help it?
Many are long to transmit the action potential over a long distance.
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What does the cell surface membrane have a lot of and what do these control?
Many gated ion channels that control the entry or exit of sodium, potassium or calcium ions.
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What pumps do they have and what is the function of these pumps?
Sodium-potassium ion pumps. These use ATP to actively transport 3Na+ out of the cell and 2K+ into the cell.
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What do neurones maintain across their cell surface membrane?
Maintain a potential difference.
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What are neurones surrounded by and what is the purpose of these cells?
Surrounded by a myelin sheath (Schwann cells) that insulates the neurone from electrical activity.
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What are the gaps between the Schwann cells called?
Nodes of Ranvier.
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What does their cell body contain?
A nucleus, mitochondria and ribosomes.
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Where is the cell body in the motor neurone and describe their axon
Cell body is in the central nervous system. Long axon that carries action potential to effector.
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Where is the cell body in a sensory receptor and describe the axon
Cell body just outside the central nervous system. Short axon carrying action potential into CNS.
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What do both sensory and motor neurones have connected to other neurones?
Dendrites. Sensory neurones have a long dendron which carries action potential from sensory receptor to the cell body.
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Other cards in this set

Card 2

Front

What do sensory neurones do?

Back

Carry the action potential from a sensory receptor to the central nervous system (CNS).

Card 3

Front

What do motor neurones do?

Back

Preview of the front of card 3

Card 4

Front

What do relay neurones do?

Back

Preview of the front of card 4

Card 5

Front

What is the function of the neurone?

Back

Preview of the front of card 5
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