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