Block 5 Neurophysiotherapy BRS W Expl Part 2

17 Questions | Total Attempts: 549

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Neurophysiology Quizzes & Trivia

Questions and Answers
  • 1. 
    Muscle stretch leads to a direct increase in firing rate of which type of nerve?
    • A. 

      A-Motoneurons

    • B. 

      Y-Motoneurons

    • C. 

      Group Ia fibers

    • D. 

      Group lb fibers

  • 2. 
    Which of the following is a characteristic of  nuclear bag fibers?
    • A. 

      They are one type of extrafusal muscle fiber

    • B. 

      They detect dynamic changes in muscle length

    • C. 

      They give rise to group lb afferents

    • D. 

      They are innervated by a-motoneurons

  • 3. 
    Which reflex is responsible for polysynaptic excitation of contralateral extensors?
    • A. 

      Stretch reflex (myotatic)

    • B. 

      Golgi tendon reflex (inverse myotatic)

    • C. 

      Flexor withdrawal reflex

    • D. 

      Subliminal occlusion reflex

  • 4. 
    Cutting which structure causes blindness in the temporal fields of the left and right eyes?
    • A. 

      Optic nerve

    • B. 

      Optic chiasm

    • C. 

      Optic tract

    • D. 

      Geniculocalcarine tract

  • 5. 
    Which of the following structures has a primary function to coordinate rate, range, force, and direction of movement?
    • A. 

      Primary motor cortex

    • B. 

      Premotor cortex and supplementary motor cortex

    • C. 

      Prefrontal cortex

    • D. 

      Basal ganglia

    • E. 

      Cerebellum

  • 6. 
    Sensory receptor potentials
    • A. 

      Are action potentials

    • B. 

      Always bring the membrane potential of a receptor cell toward threshold

    • C. 

      Always bring the membrane potential of a receptor cell away from threshold

    • D. 

      Are graded in size, depending on stimulus intensity

    • E. 

      Are all-or-none

  • 7. 
    Complete transection of the spinal cord at the level of T1 would most likely result in
    • A. 

      Temporary loss of stretch reflexes belowthe lesion

    • B. 

      Temporary loss of conscious proprioception below the lesion

    • C. 

      Permanent loss of voluntary control of movement above the lesion

    • D. 

      Permanent loss of consciousness above the Lesion

  • 8. 
    The inability to perform rapidly alternating movements (dysdiadochokinesia) is associated with lesions of the
    • A. 

      Premotor cortex

    • B. 

      Motor cortex

    • C. 

      Cerebellum

    • D. 

      Substantia nigra

    • E. 

      Medulla

  • 9. 
    Which autonomic receptor is activated by low concentrations of epinephrine released from the adrenal medulla and causes vasodilation?
    • A. 

      Adrenergic a receptors

    • B. 

      Adrenergic pi receptors

    • C. 

      Adrenergic p, receptors

    • D. 

      Cholinergic muscarinic receptors

    • E. 

      Cholinergic nicotinic receptors

  • 10. 
    A lesion of the chorda tympani nerve would most likely result in
    • A. 

      Impaired olfactory function

    • B. 

      Impaired vestibular function

    • C. 

      Impaired auditory function

    • D. 

      Impaired taste function

    • E. 

      Nerve deafness

  • 11. 
    Which of the following would produce maximum excitation of the hair cells in the right horizontal semicircular canal?
    • A. 

      Hyperpolarization of the hair cells

    • B. 

      Bending the stereocilia away from the kinocilia

    • C. 

      Rapid ascent in an elevator

    • D. 

      Rotating the head to the right

  • 12. 
    Pathogens that produce fever cause
    • A. 

      Decreased production of interleukin-1 (IL-1)

    • B. 

      Decreased set-point temperature in the hypothalamus

    • C. 

      Shivering

    • D. 

      Vasodilation of blood vessels in the skin

  • 13. 
    Which of the following statements about the olfactory system is true?
    • A. 

      The receptor cells are neurons

    • B. 

      The receptor cells are sloughed off and are not replaced

    • C. 

      Axons of cranial nerve (CN) I are A-delta fibers

    • D. 

      Axons from receptor cells synapse in the prepiriform cortex

    • E. 

      Fractures of the cribriform plate can cause inability to detect ammonia

  • 14. 
    Which of the following is a step in photoreception in the rods?
    • A. 

      Light converts all-trans retinal to 11-cisretinal

    • B. 

      Metarhodopsin II activates transducin

    • C. 

      Cyclic guanosine monophosphate (cGMP) levels increase

    • D. 

      Rods depolarize

    • E. 

      Release of neurotransmitter increases

  • 15. 
    Which of the following autonomic drugs acts by stimulating adenylate cyclase?
    • A. 

      Atropine

    • B. 

      Clonidine

    • C. 

      Curare

    • D. 

      Norepinephrine

    • E. 

      Phentolamine

    • F. 

      Phenylephrine

    • G. 

      Propranolol

  • 16. 
    Aballet dancer spins to the left. During the spin, her eyes snap quickly to the left. This fast eye movement is
    • A. 

      Nystagmus

    • B. 

      Post-rotatory nystagmus

    • C. 

      Ataxia

    • D. 

      Aphasia

  • 17. 
    Which of the following has a much lower concentration in the cerebrospinal fluid (CSF) than in cerebral capillary blood?
    • A. 

      Na+

    • B. 

      K+

    • C. 

      Osmolarity

    • D. 

      Protein

    • E. 

      Mg2+

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