Block 5 Neurophysiotherapy BRS W Expl Part 2

17 Questions | By Chachelly | Last updated: Mar 21, 2022 | Total Attempts: 848

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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+