7 - physiology new mcqs - part 1

1q. human brain is more intelligent than monkey’s brain due to ?

 

1. larger brain
2. increased convulations
3. increased brain area compared to body surface area
4. more blood supply

 

answer: a. larger brain .

 

2q. ability to perceive shape and size is lost due to lesion of ?

 

1. tractus gracilis
2. tractus cuneatus
3. spinothalamic tract
4. spinoreticular tract

 

answer : b . tractus cuneatus .

 

3q. true about function of the brain are all except ?

 

1. sensitive to hypoxia
2. dependent on glucose
3. uses fatty acid in starvation
4. does not store energy

 

answer: c . brain uses ketone bodies in starvation .

 

4q. ablation of the somatosensory area I  of the cerebral cortex leads to ?

 

1. total loss of pain sensation
2. total loss of touch sensation
3. loss of tactile localization and not of two point discrimination
4. loss of tactile localization and two point discrimination

 

answer: d . loss of both tactile localization and two point discrimination. If somatosensory area II is ablated then there will be alteration in pain sensation .

 

5q. structure of the brain involved in emotion ?

 

1. neocortex
2. limbic system
3. thalamus
4. hippocampus
5. basal ganglia

 

answer: b and d .

6q. motor aphasia refers to defect in ?

 

1. peripheral speech apparatus
2. verbal expression
3. auditory comprehension
4. verbal comprehension

 

answer: b . verbal expression . motor aphasia also known as expressive aphasia is a disorder of thought and word finding resulting in inadequate verbal expression .

 

7q. true stereopsis ( depth of perception ) is perceived due to the following ?

 

1. overlay of contours
2. motion parallax
3. bi-nasal disparity
4. linear perspective

 

answer: c . binasal disparity , this is also called horizontal disparity or retinal disparity or binocular disparity .

 

8q. the fibers from the contralateral nasal hemiretina project to the following layers of the lateral geniculate body ?

 

1. layers 2,3,5
2. layers 1,2,6
3. layers 1,4,6
4. layers 4,5,6

 

answer: c . layers 1,4,6 . the fibres from the ipsilateral temporal hemiretina end in layers 2,3,5 and the fibers from the contralateral nasal hemiretina project into the 1,4,6 layers .

 

9q. most afferent fibers from the lateral geniculate body terminate in which layer of the primar visual cortex ( area 17 ) ?

 

1. layer 1
2. layer 2 and 3
3. layer 4
4. layer 5 & 6

 

answer: c . layer 4 .

 

10q. the blobs of the visual cortex are associated with ?

 

1. ocular dominance
2. orientation
3. color processing
4. saccadic eye movements

 

answer: c . color processing .