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6. True or false: An action potential in the motor neuron will always result in a muscle contraction?

  • Pass
  • True
  • False
  • 1966

7. Select the structure which can be found most posterior in the spinal cord.

  • Dorsal horn
  • Ventral horn
  • Lateral horn
  • Central canal

8. Which of the following features allow the post-synaptic terminal to be an effective site of neurotransmitter reception?

  • Complex junctional folds, large surface area & few receptors
  • Simple junctional folds, large surface area & lots of receptors
  • Complex junctional folds, large surface area & lots of receptors
  • Complex junctional folds, small surface area & lots of receptors

9. What range of muscle fibres can one LMN innervate?

  • 1-100 muscle fibres
  • 10-1000 muscle fibres
  • 1000-10000 muscle fibres
  • 10-10000 muscle fibres

10. Through what mechanism is ACh released from the presynaptic membrane?

  • Calcium-dependent exocytosis
  • Sodium-dependent endocytosis
  • Calcium-dependent endocytosis
  • Sodium-dependent exocytosis

11. What type of matter is contained within the dorsal horn?

  • Grey matter
  • No matter what they tell us
  • White matter
  • Black matter

12. How many sub-units make up the nicotinic type II receptors?

  • Three
  • Six
  • Four
  • Five

13. Where are the greatest potentials recorded?

  • At the NMJ
  • At the pre-synaptic terminal
  • At the end of the muscle fibre (furthest from the NMJ)
  • In the middle of the muscle fibre

14. True or false: a single AP will result in a single twitch?

  • Pass
  • 1945
  • True
  • False

15. Select the most accurate statement regarding lower motor neurons.

  • LMNs are myelinated & their cell body is in lamina IX of the spinal cord
  • LMNs are unmyelinated & their cell body is in lamina XI of the spinal cord
  • LMNs are unmyelinated & their cell body is in lamina IX of the spinal cord
  • LMNs are myelinated & their cell body is in lamina XI of the spinal cord

16. What are the two products of the metabolism of ACh?

  • Acetic Acid & Cholinesterase
  • Acetylcholine & Ester
  • Acetic Acid & Choline
  • Acetyl CoA & Choline

17. What is a motor unit?

  • A group of up to ten motor end plates
  • A single muscle fibre
  • A group of muscle fibres innervated by a single motor neuron
  • A group of up to ten sarcomeres

18. True or false: Very high frequencies of stimuli will result in tetanus (smooth contraction resulting in generation of maximum tension)?

  • True
  • 1914
  • False
  • Pass

19. Which enzyme rapidly hydrolyses ACh after it has caused signal transduction on the post-synaptic terminal?

  • Amylase
  • AChase
  • Acetylcholinesterase
  • Butyrylcholinesterase

20. True or false: depolarisations rapidly decline as your move further away from the NMJ?

  • Pass
  • 1984
  • True
  • False