Nervous System

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Author:
Marine
ID:
302260
Filename:
Nervous System
Updated:
2015-06-12 00:08:51
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physiology physio
Folders:
Physio
Description:
Nervous System
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  1. Descendent pyramidal tracts do not control:
    A. synaptic transmission in the spinal cord
    B. activity of osmoreceptors
    C. skeletal muscles functions
    D. activity in gama efferents
    B. activity of osmoreceptors
    (this multiple choice question has been scrambled)
  2. The vomiting centre
    A. is in the cerebral cortex
    B. does not exist. Vomiting is a local reflex in the stomach
    C. is in the hypothalamusis
    D. in the medulla
    E. is in the thalamus
    D. in the medulla
    (this multiple choice question has been scrambled)
  3. Cerebral blood flow under normal conditions is
    A. about 750 ml/min
    B. significantly increased by physical exercise
    C. strongly modified by vasomotor regulation
    D. increased during hyperoxia
    E. about 150 ml/min
    A. about 750 ml/min
    (this multiple choice question has been scrambled)
  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. disorder in body temperature regulation
    E. change in intracellular concentration of lipoproteins
    D. disorder in body temperature regulation
    (this multiple choice question has been scrambled)
  5. Body temperature regulation is dependent on temperature of blood flowing through:
    a. skin
    b. adrenal medulla
    c. hypothalamus
    d. skeletal muscle
    • a. 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:
    A. it only occurs during voluntary movements
    B. it is present at rest
    C. it is decreased during activity
    D. its amplitude remains constant during voluntary movements
    E. its frequency is very regular
    A. it only occurs during voluntary movements
    (this multiple choice question has been scrambled)
  7. Choreiform movements in humans are most likely to be associated with:
    A. lateral spinothalamic tracts
    B. nigrostriatal tracts
    C. caudate nucleus
    D. cerebellum
    E. degeneration of thesubthalamic nuclei (corpus Luysi)
    C. caudate nucleus
    (this multiple choice question has been scrambled)
  8. The stimulation of electrodes implanted in the medial forebrain bundle (tractus telencephalicus medialis) of experimental animals is most likely to lead to:
    A. avoidance reactions
    B. repeated turning movements
    C. rage reactions
    D. temporary paralysis
    E. repeated self-stimulation
    E. repeated self-stimulation
    (this multiple choice question has been scrambled)
  9. Many neurons in the basal ganglia are observed to begin to discharge:
    A. during visual accommodation
    B. at the onset of acoustic stimulation
    C. in association with somatosensory stimulation
    D. before the onset of voluntary movements
    E. at a low rate that is independent of motor activity
    D. before the onset of voluntary movements
    (this multiple choice question has been scrambled)
  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 closing of voltage-gated sodium channels
    B. electrotonic spread of the resultant depolarisation to the axon hillock, where it induces openning of voltage-gated sodium channels
    C. electrotonic spread of the resultant hyperpolarisation to the axon hillock, where it induces the opening of voltage-gated sodium channels
    D. electrotonic spread of the resultant depolarisation to the axon hillock, where it induces closing of voltage-gated sodium channels
    E. electrotonic spread of the resultant depolarisation to the soma, where it induces the opening of voltage-gated sodium channels
    B. electrotonic spread of the resultant depolarisation to the axon hillock, where it induces openning of voltage-gated sodium channels
    (this multiple choice question has been scrambled)
  11. Reflex sneezing is most likely to be initiated by:
    A.inhibition of olfactory receptor neurons
    B. stimulation of nasal trigeminal nerve endings
    C. stimulation of efferent fibers from olfactory striae
    D. stimulation of olfactory receptor neurons
    E. stimulation of gustatory receptors
    B. stimulation of nasal trigeminal nerve endings
    (this multiple choice question has been scrambled)
  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. 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:
    A. hyperpolarizing the membrane potential of alpha motoneurons
    B. decreasing the potassium permeability of the alpha motoneuron
    C. increasing the chloride permeability of the presynaptic nerve ending
    D. increasing the amount of the neurotransmitter released by the presynaptic nerve ending
    E. decreasing the frequency of action potentials by the presynaptic nerve ending
    C. increasing the chloride permeability of the presynaptic nerve ending
    (this multiple choice question has been scrambled)
  14. Which one of the following hypothalamic nuclei is responsible for controlling the normal circadian rhythm?
    A. suprachiasmatic nucleus
    B. paraventricular nucleus
    C. lateral nucleus
    D. arcuate nucleus
    E. ventromedial nucleus
    A. suprachiasmatic nucleus
    (this multiple choice question has been scrambled)
  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:
    A. the parietal lobe
    B. the reticular activating system
    C. the limbic system
    D. the temporal lobe
    E. the hippocampus
    D. the temporal lobe
    (this multiple choice question has been scrambled)
  17. Important function of gamma motoneurons is to
    A. stimulate skeletal muscle contraction:
    B. prevent muscles from producing too much force
    C. generate activity in Ib afferent fibers
    D. detect the length of resting skeletal muscle
    E. maintain Ia afferent activity during contraction of muscle
    E. maintain Ia afferent activity during contraction of muscle
    (this multiple choice question has been scrambled)
  18. Rapid eye movement (REM) sleep is:
    A. the first state of sleep entered when person falls asleep
    B. accompanied by loss of skeletal muscle tone
    C. occurs more often in adults than in children
    D. is characterized by slow but steady heart rate
    E. lasts longer than periods of slow-wave sleep
    B. accompanied by loss of skeletal muscle tone
    (this multiple choice question has been scrambled)
  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. 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

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