The diagram shows a motor neuron - Leaving Cert Biology - Question 4 - 2008
Question 4
The diagram shows a motor neuron.
(a) Identify parts A, B and C.
A ................................................................................. B ................ show full transcript
Worked Solution & Example Answer:The diagram shows a motor neuron - Leaving Cert Biology - Question 4 - 2008
Step 1
Identify parts A, B and C.
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Answer
A: myelin sheath or Schwann cell.
B: myelin sheath or axon.
C: dendrite.
Step 2
Give a function of A.
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Answer
A (myelin sheath) insulates or protects the neuron and speeds up the impulse (message).
Step 3
Place an arrow on the diagram to show the direction of the impulse.
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Answer
An arrow should be drawn from the dendrites (C) towards the cell body.
Step 4
Give a function of C.
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C (dendrite) receives or carries the impulse (message) to the cell body.
Step 5
Place an X on the diagram at a point at which a neurotransmitter substance is secreted.
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X should be placed on the terminal dendrites on the left.
Step 6
What is the role of the motor neuron?
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Answer
The role of the motor neuron is to receive or carry impulses (messages) from the central nervous system (CNS) to muscles or glands/effectors.
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