Nervous System

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excalibolg
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301757
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Nervous System
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2015-04-29 08:01:33
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Physiology lf2
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  1. Descendent pyramidal tracts do not control:
    a. synaptic transmission in the spinal cord b.activity in gama efferents
    c.activity of osmoreceptors
    d skeletal muscles functions
    d.
  2. The vomiting centreis in the:
    a.cerebral cortexis in the thalamus
    b. is in the hypothalamusis
    c. in the medulla
    d. does not exist. Vomiting is a local reflex in the stomach
    c
  3. Cerebral blood flow under normal conditions is a. strongly modified by vasomotor regulation
    b. increased during hyperoxia
    c. about 150 ml/min
    d. about 750 ml/min
    e. significantly increased by physical exercise
    d
  4. After the hypothalamic lesion we can expect:
    a. change in plasma level of Ca2+
    b. change in plasma level of acetoacetic acid
    c. change in plasma level of free fatty acids
    d. change in intracellular concentration of lipoproteins
    e. disorder in body temperature regulation
    e
  5. Body temperature regulation is dependent on
     temperature of blood flowing through:
    a. skin
    b. adrenal medulla
    c. hypothalamus
    d. skeletal muscle
    a,c
  6. Tremor that is caused by a cerebellar lesion is most readily differentiated from that caused by loss of the dopaminergic nigrostriatal tracts in that:
    a. it is present at rest
    b. it is decreased during activity
    c. it only occurs during voluntary movements
    d. its frequency is very regular
    e. its amplitude remains constant during voluntary movements
    c
  7. Choreiform movements in humans are most likely to be associated with:
    a. degeneration of thesubthalamic nuclei (corpus Luysi)
    b. nigrostriatal tracts
    c. cerebellum
    d. lateral spinothalamic tracts
    e. caudate nucleus
    e
  8. The stimulation of electrodes implanted in the medial forebrain bundle (tractus telencephalicus medialis) of experimental animals is most likely to lead to:
    a. repeated self-stimulation
    b. rage reactions
    c. avoidance reactions
    d. temporary paralysis
    e. repeated turning movements
    a
  9. Many neurons in the basal ganglia are observed to begin to discharge:
    a. in association with somatosensory stimulation
    b. at the onset of acoustic stimulation
    c. before the onset of voluntary movements
    d. at a low rate that is independent of motor activity
    e. during visual accommodation
    c
  10. A motor neuron recieves an excitatory stimulus at its dendritic terminus. In order for that stimulus to result in an action potential, there must be:
    a. electrotonic spread of the resultant hyperpolarisation to the axon hillock, where it induces the opening of voltage-gated sodium channels
    b. electrotonic spread of the resultant depolarisation to the soma, where it induces the opening of voltage-gated sodium channels
    c. electrotonic spread of the resultant hyperpolarisation to the axon hillock, where it induces closing of voltage-gated sodium channels
    d. electrotonic spread of the resultant depolarisation to the axon hillock, where it induces openning of voltage-gated sodium channels
    e. electrotonic spread of the resultant depolarisation to the axon hillock, where it induces closing of voltage-gated sodium channels
    d
  11. Reflex sneezing is most likely to be initiated by:
    a.inhibition of olfactory receptor neurons
    b. stimulation of olfactory receptor neurons
    c. stimulation of nasal trigeminal nerve endings
    d. stimulation of gustatory receptors
    e. stimulation of efferent fibers from olfactory striae
    c
  12. Decerebrate rigidity after transection of the midbrain between the colliculi is:
    a. consequence of removal of the supraspinal inhibition of spinal motoneurons
    b. result of removal of the supraspinal facilitation of spinal motoneurons
    c. is not possible in the animal without the cerebellum
    d. primarily facilitation of spinal reflexes
    e. nothing of above is true
    a,d
  13. Presynaptic inhibition in the CNS affects the firing rate of alpha motoneurons by:
    a. decreasing the frequency of action potentials by the presynaptic nerve ending
    b. decreasing the potassium permeability of the alpha motoneuron
    c. increasing the chloride permeability of the presynaptic nerve ending
    d. hyperpolarizing the membrane potential of alpha motoneurons
    e. increasing the amount of the neurotransmitter released by the presynaptic nerve ending
    c
  14. Which one of the following hypothalamic nuclei is responsible for controlling the normal circadian rhythm?
    a. paraventricular nucleus
    b. ventromedial nucleus
    c. arcuate nucleus
    d. lateral nucleus
    e. suprachiasmatic nucleus
    e
  15. The rapid voluntary flexion of the arm is accompanied by:
    a. an decrease in the activity of the Ia fibers from the biceps (the agonist)
    b. an increase in the activity of the Ib fibers from the biceps (the agonist)
    c. an decrease in the activity of the Ib fibers from the triceps (the antagonist)
    d. an increase in the activity of the Ia fibers from the triceps (the antagonist)
    e. an increase in the activity of alpha motoneurons to triceps (the antagonist)
    a,b,d
  16. Aphasia is most likely to be associated with a lesion of:
    a. the hippocampus
    b. the temporal lobe
    c. the parietal lobe
    d. the limbic system
    e. the reticular activating system
    b
  17. Important function of gamma motoneurons is tostimulate skeletal muscle contraction:
    a. maintain Ia afferent activity during contraction of muscle
    b. generate activity in Ib afferent fibers
    c. detect the length of resting skeletal muscle
    d. prevent muscles from producing too much force
    b
  18. Rapid eye movement (REM) sleep is:
    a. the first state of sleep entered when person falls asleep
    b. is characterized by slow but steady heart rate
    c. accompanied by loss of skeletal muscle tone
    d. lasts longer than periods of slow-wave sleep
    e. occurs more often in adults than in children
    c
  19. Increased activity of the sympathetic nervous system causes:
    a. pupillary constriction
    b. ejaculation
    c. accommodation for near vision
    d. gallbladder dilatation
    e. bronchiolar dilatation
    b,e
  20. The alpha rhythm appearing on an electroencephalogram
    a. produces 20 to 30 waves per second
    b. disappears when a patient´s eyes open
    c. is replaced by slower, larger waves during deep sleep
    d. represents activity that is most pronounced in the frontal region of the brain
    e. is associated with REM sleep
    b,c

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