Neurophysiology Set 1

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Neurophysiology 1

MCQ

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1. A man falls into a deep sleep with one arm under his head.
Th is arm is paralyzed when he awakens, but it tingles, and pain
sensation in it is still intact. Th e reason for the loss of motor
function without loss of pain sensation is that in the nerves
to his arm :

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2. Which of the following best describes an expanded tip tactile receptor found in the dermis of hairy
skin that is specialized to detect continuously applied touch sensation?

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3. The release of neurotransmitter at a chemical synapse in the central nervous system is dependent upon
which of the following?

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4. Which of the following statements about nerve growth factor is
not true :

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5. The functions of tropomyosin in skeletal muscle include

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6. Hypoventilation has which of the following effects on neuronal activity?

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7. Which of these cells are not a type of neuroglia found in the CNS :

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8. Forced rapid breathing results in alkalization of the blood which would lead to which of the
following changes in neuronal activity?

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9. The action potential of skeletal muscle :

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10. Which of the following is best described as an elongated, encapsulated receptor found in the dermal
pegs of glabrous skin and is especially abundant on lips and fingertips?

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11. Which of the following is not correctly paired :

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12. Which of the following is an important functional parameter of pain receptors?

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13. Which of the following represents the basis for transduction of a sensory stimulus into nerve
impulses?

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14. In a neuron with a resting membrane potential of −65mV, the distribution of which ion across the
neuronal membrane represents the greatest potential electromotive force (EMF)?

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15. A 35-year-old woman sees her physician to report muscle
weakness in the extraocular eye muscles and muscles of the
extremities. She states that she feels fine when she gets up in
the morning, but the weakness begins soon after she becomes
active. The weakness is improved by rest. Sensation appears
normal. The physician treats her with an anticholinesterase
inhibitor, and she notes immediate return of muscle strength.
Her physician diagnoses her with

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16. Clostridium botulinum toxin affecting the
neuromuscular junction by the following
mechanism :

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17. The first-order (primary afferent) cell bodies of the dorsal column–medial lemniscal system are
found in which of the following structures?

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18. The velocity of nerve conduction is increased with a decrease in the:

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19. Initiation of an action potential in skeletal muscle :

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20. Which of the following is the system that transmits somatosensory information with the highest
degree of temporal and spatial fidelity?

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21. Gap junctions :

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22. Pain receptors in the skin are typically classified as which of the following?

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23. Excitation-contraction coupling in smooth muscle is initiated when calcium bind to :

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24. The cross-bridges of the sarcomere in skeletal muscle are made
up of

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25. Which of the following substances enhances the sensitivity of pain receptors but does not directly
excite them?

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