Central nervous system MCQs


Central nervous system MCQs


1. True or false 

a) Pacinian corpuscles are innervated by the Aδ fibers
b) Extreme heat is mediated by nociceptors
c) Pain receptors are tonic receptors
d) Pacinin corpuscles adapt very slowly
e) The number of receptors activated is important in coding the intensity of sensation 


2. True or false

a) The sensor unit consists branches of one sensory axon
b) Areas supplied by sensory units are not overlapped
c) Stronger stimuli recruit neighboring sensory units
d) The receptive field of sensory unit of arm is larger than that of a finger tip
e) Stronger stimuli increase frequency of impulses



3. True or false

a) Cortical lesion does not abolish somatic sensation
b) Temperature and pain sensibility are most affected by cortical lesions
c) Lesions of SI cause deficits in joint position sense and in the ability of discriminate size and shape
d) The thalamus is the relay station for all the sensations
e) SII is located in the wall of the sylvian fissure 


4. Pain

a) The fibers of the opposite side of the body are in the lateral spinothalamic tract
b) Originating in the diaphragm refers to the tip of the shoulders
c) Of the viscera is associated with nausea and vomiting
d) Type a fibers conduct faster than Aδ fibers
e) Can be referred from a deep somatic structure to another somatic structure



5. True or false regarding cutaneous sensory modalities

a) Temperature sense is transmitted via large diameter Aβ fibers
b) Loss of vibration sense is a recognized feature of the ipsilateral posterior column lesion
c) Tactile impulses are known to inhibit pain transmission
d) Perception of pain is abolished when the primary sensory cortex is damaged
e) Two point discrimination is better demonstrated in the hand than in the back of the chest wall 
 

6. In sensory receptors

a) Stimulus energy is converted into local depolarization
b) The generator potential is graded and self propagating
c) A generator potential can be produced by only one form of energy
d) The frequency of action potential generated doubles when the strength of the stimulus doubles
e) Serving touch sensation , constant suprathreshold stimulation causes an action potential to be generated at a constant rate .



7. Regarding pain

a) The analgesic effect of placebos is due to activation of peripheral Aδ fibers
b) Anterolateral cordotomy performed to relive the pain in the right leg interrupts left lateral spinothalmic tract
c) Transmitter for slow serve pain is glutamate
d) Visceral pain is carried by Aδ fibers



8. Increased γ motor discharge

a) Stimulate intrafusal fibers
b) Is observed in upper motor neuron lesion
c) Causes exaggerated tendon reflex
d) Causes reflex muscle contraction
e) Is coupled to motor neuorne excitation

Answer

1.

a) F
b) T
c) T
d) F
e) T

2.

a) T
b) F
c) T
d) T
e) T

3.

a) T
b) F
c) T
d) F
e) T 


4.

a) T
b) T
c) T
d) F
e) T

5.

a) F
b) T
c) T
d) F
e) T

6.

a) T
b) F
c) F
d) F
e) F

7.

a) T
b) T
c) T
d) T

8.

a) T
b) T
c) T
d) T
e) T

Written by

hope MCQs help you . if you have MCQs send Us

 

© 2013 Physiology MCQs SEQs and Revision. All rights resevered. Designed by Templateism

Back To Top