Nervous System

  1. Descendent pyramidal tracts do not control:



    A. activity of osmoreceptors
  2. The vomiting centre




    E. in the medulla
  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. about 750 ml/min
  4. After the hypothalamic lesion we can expect:




    B. disorder in body temperature regulation
  5. Body temperature regulation is dependent on temperature of blood flowing through:



    • D. skin
    • c. hypothalamus
  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:




    B. it only occurs during voluntary movements
  7. Choreiform movements in humans are most likely to be associated with:




    D. caudate nucleus
  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
  9. Many neurons in the basal ganglia are observed to begin to discharge:




    E. before the onset of voluntary movements
  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:




    B.  electrotonic spread of the resultant depolarisation to the axon hillock, where it induces openning of voltage-gated sodium channels
  11. Reflex sneezing is most likely to be initiated by:




    A. stimulation of nasal trigeminal nerve endings
  12. Decerebrate rigidity after transection of the midbrain between the colliculi is:




    • A. consequence of removal of the supraspinal inhibition of spinal motoneurons
    • d. primarily facilitation of spinal reflexese. nothing of above is true
  13. Presynaptic inhibition in the CNS affects the firing rate of alpha motoneurons by:




    B. increasing the chloride permeability of the presynaptic nerve ending
  14. Which one of the following hypothalamic nuclei is responsible for controlling the normal circadian rhythm?




    A. suprachiasmatic nucleus
  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. 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)
    • d. an increase in the activity of the Ia fibers from the triceps (the antagonist)
  16. Aphasia is most likely to be associated with a lesion of:




    D. the temporal lobe
  17. Important function of gamma motoneurons is to




    C. maintain Ia afferent activity during contraction of muscle
  18. Rapid eye movement (REM) sleep is:




    A. accompanied by loss of skeletal muscle tone
  19. Increased activity of the sympathetic nervous system causes:




    • B. ejaculation
    • e. bronchiolar dilatation
  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. disappears when a patient´s eyes open
    • c. is replaced by slower, larger waves during deep sleep
Author
Marine
ID
302260
Card Set
Nervous System
Description
Nervous System
Updated