Block 5 Neurophysiotherapy BRS W Expl Part 2
- 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+
Questions: 10 | Attempts: 10911 | Last updated: Apr 13, 2021
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Sample QuestionA 41-year-old man is brought to the emergency department after an accident at a construction site. The examination reveals a weakness(hemiplegia) and a loss of vibratory sensation and discriminative touch all on the left lower extremity, and a loss of pain and thermal sensations on the right lower extremity. CT shows a fracture of the vertebral column adjacent to the T8 level of the spinal cord. Damage to which of the following fiber bundles or tracts would most likely explain the loss of vibratory sensation in this man?
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