Myelinated motor neurons

Last updated: 31/03/2022

AQA A-Level Biology Nervous coordination Myelinated motor neurons

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Question 1 of 27

1. Question
When the axon is covered with a myelin sheath then the nerve fibre is known as a________.
- myelinated motor neuron
- motor neuron
- myelinated axon
- unmyelinated motor neuron
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Question 2 of 27

2. Question
The Schwann cells form a myelin sheath around the…
- axon
- dendrites
- nodes of Ranvier
- cell body
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Question 3 of 27

3. Question
The myelin sheath is present at specific gaps and these gaps are known as…
- nodes of Ranvier
- dendrites
- axon
- motor neuron
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Question 4 of 27

4. Question
The motor neurons of the PNS are _________ but the neurons which form the autonomic nervous system are ________motor neurons.
- myelinated, unmyelinated
- unmyelinated, unmyelinated
- myelinated, myelinated
- unmyelinated, myelinated
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Question 5 of 27

5. Question
Which of the following best describes the waxy-appearing material called myelin?
- a mass of white lipid material that insulates the axon of a neuron
- an outermembrane on a neuroglial cell
- a lipid-protein (lipoprotein) cell membrane on the outside of axons
- a mass of white lipid material that surrounds the cell body of a neuron
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Question 6 of 27

6. Question
Myelinated motor neuron is a type of motor neuron, it possesses the _______ structure of a motor neuron.
- basic single cell
- multiple cell
- complex cell structure
- none of these
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Question 7 of 27

7. Question
The presence of a myelin sheath makes the neuron _____ and helps in faster nerve impulse conduction.
- thicker
- thinner
- viscose
- aqueous
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Question 8 of 27

8. Question
Motor neurons consist of all the classes of ________ organelles.
- eukaryotic cell
- prokaryotic cell
- both of these
- none of these
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Question 9 of 27

9. Question
The structure of myelinated motor neuron consists of…?
- All of these
- Axon
- Cell body
- Dendrites
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Question 10 of 27

10. Question
Myelinated motor neurons are_____, which means they have a single axon and multiple dendrites in their structure.
- multipolar
- unipolar
- polar
- non-polar
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Question 11 of 27

11. Question
Impulse conduction is fastest in neurons that are…?
- myelinated
- unmyelinated
- sensory
- motor
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Question 12 of 27

12. Question
The branch-like extension that is present at the end of a neuron is known as a ________.
- dendrite
- axon
- cell body
- none of these
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Question 13 of 27

13. Question
White matter refers to myelinated fibres in the…?
- CNS
- PNS
- SNS
- Both ANS and SNS
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Question 14 of 27

14. Question
What part of a motor neuron is responsible for receiving information?
- dendrite
- myelin sheath
- axon
- terminal fibre
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Question 15 of 27

15. Question
The other name for Schwann cells is…?
- Neurolemmocytes
- Oligodendrocytes
- Oligodendroglia
- All of these
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Question 16 of 27

16. Question
Several arm-like processes arise from the cell body of a single __________.
- Oligodendrocyte
- Neurolemmocytes
- Schwann cells
- Motor neuron
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Question 17 of 27

17. Question
Which one is true about schwann cells?
- All of these
- These cells have a flat surface.
- During the process of myelination, only one axon is myelinated by a single schwann cell.
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Question 18 of 27

18. Question
In myelinated motor neurons, nodes of Ranvier are present, which are important for________conduction, transmitting signals faster than the unmyelinated motor neurons.
- saltatory nerve impulse
- nerve impulse conduction
- action potencial
- none of these
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Question 19 of 27

19. Question
A myelinated motor neuron transmits signals at roughly ________.
- 100 m/s
- 1000 m/s
- 50 m/s
- 10 m/s
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Question 20 of 27

20. Question
Motor neurons are present in the…
- all of these
- cerebral cortex of the brain
- brain stem
- spinal cord
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Question 21 of 27

21. Question
What is the role of dendrites in the case of motor neurons?
- forms a synapse
- propagates the action potential down the neuron
- works as receptors
- provides protection
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Question 22 of 27

22. Question
Which of these is a disease of the myelin sheath?
- Multiple sclerosis
- Polio
- Leprosy
- Alzheimer's
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Question 23 of 27

23. Question
Which structure of myelinated neurons carry out transmission of signals?
- Nodes of Ranvier
- Schwann cell
- Axolemma
- Axon hillock
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Question 24 of 27

24. Question
The ___________ are present in the central nervous system.
- upper motor neurons
- lower motor neurons
- middle motor neurons
- all of these
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Question 25 of 27

25. Question
Which of these is not true about visceral motor neurons?
- These are responsible for the movement of bones.
- Branchiomeric muscles are controlled by them.
- These muscles basically include the muscles of the face and neck.
- They are involved in transmitting signals to organ-related muscles to stimulate them.
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Question 26 of 27

26. Question
Myelin sheath is a ________layer that protects the motor neurons.
- fatty acid
- amino acid/protein
- carbohydrates
- lipid bilayer
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Question 27 of 27

27. Question
Myelin sheath is present in the motor neurons of…?
- Both of these
- Central nervous system
- Peripheral nervous system
- None of these
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