Organisms Respond to Changes in their Internal and External Environments: Nervous Coordination - Nerve Impulses, Structure of a Motor Neurone Flashcards

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1
Q

What is a motor neurone?

A
  • Neurones that carry information from the CNS to the effectors
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2
Q

List the different structural features of a myelinated motor neurone

A
  • Dendrites
  • Axon
  • Myelin sheath
  • Node of Ranvier
  • Cell body
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3
Q

Draw and label the structure of a myelinated motor neurone

A
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4
Q

What are dendrites?

A
  • Transmits impulses toward the cell body
  • Connects with other neurones
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5
Q

What is an axon?

A
  • Transmits impulses away from the cell body
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6
Q

What is a myelin sheath?

A
  • Layer that allows electrical impulses to transmit quickly and efficiently along the nerve cells
  • Made of Schwann cells
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7
Q

What are nodes of Ranvier?

A
  • Gaps between adjacent Schwann cells
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8
Q

What does the cell body contain?

A
  • Organelles
  • Nucleus
  • Many RERs
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9
Q

Why does the cell body contain nuclei and many RERs?

A
  • To make neurotransmitters, which are proteins
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10
Q

Describe adaptations of the axon

A
  • Schwann cells wrap around the axon until up to a hundred layers of lipid and protein membranes are present
  • Provides protection from surrounding tissue fluid
  • Provides electrical insulation
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