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synapse and sensory system

Nada Medhat 10 questions

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Questions in this quiz (10)

  1. 1Regarding sensory receptor properties
    1. AAll receptors respond to a specific quality of a stimulus
    2. BA touch receptor will generate a constant rate of discharge of its axon for as long as the receptor is stimulated.
    3. CThe frequency of a train of action potentials in an afferent fibre reflects the intensity of the stimulus given to its receptor
    4. DThe first step in sensory transduction is the generation of an action potential
  2. 2Receptors that respond when a stimulus is first applied, but quickly stop responding to continual stimulation, are the
    1. Aphasic receptors
    2. Bnocioreceptors
    3. Cexteroceptors
    4. Dtonic receptors
  3. 3An environmental stimulus acting on the body initially produces an electrical response, called a(n) .................. in the receptor neuron
    1. Agenerator potential
    2. Bexcitatory postsynaptic potential
    3. Caction potential
    4. Dstimulus potential
  4. 4Alkalosis .......neuronal activity , while acidosis ....... neuronal activity
    1. Aincreases , increases
    2. B.increases,decreases
    3. Cdecreases, increases
    4. Ddecreases,decreases
  5. 5Synaptic transmission is inhibited by all the following, except
    1. Aoxygen lack
    2. Balkalosis
    3. Cacidosis
    4. Dprolonged activity of synapse
  6. 6Post-tetanic Potentiation in synapses
    1. Ais due to increased Ca ++ concentration in postsynaptic neurons
    2. Bis due to increased Ca ++ influx into presynaptic neurons
    3. Cresults from slow prolonged stimulation of synapse
    4. Dcauses fatigue of the synapse
  7. 7Intermittent Claudications evoke
    1. Avisceral pain
    2. Bdeep pain
    3. Ccutaneous hyperalgesia
    4. Dcolicky pain
  8. 8in hemisection of the spinal cord , all the following are true EXCEPT:-
    1. Aanethesia is found at the level of lesion ipsilaterally
    2. Bhyperthesia nay present above the level of lesion on the same side due to irritation of dorsal root
    3. Cspastic paralysis and exaggerated muscle reflex is found contralaterally below level of lesion
    4. Dall of the above are true
  9. 9when sensory area I of the cerebral cortex is ablated
    1. Aperception of pain is completely abolished
    2. Bperception of touch is completely abolished
    3. Cthere is loss of tactile localization but two point discrimination is spared
    4. Dthere is loss of tactile localization as well as two point discrimination
  10. 10which of the following NOT produce intracranial headache :-
    1. Abrain tumor
    2. Blumbar puncture
    3. Cconstipation and alcohol
    4. Dotitis media

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medicate and innovate for services the medical student group
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