Top 150+ Solved Nervous System MCQ Questions Answer
Q. The chemical agent that initiates impulses in pain fibres is:
a. ATP
b. substance P
c. Ca2+
d. H+
e. K+
Q. Regarding thermoceptors:
a. there are more warm receptors than cold receptors
b. cold receptors respond to 10-38°C
c. afferents for cold receptors are C fibres only
d. afferents found in the ventral spinothalamic tract
e. respond to the temperature gradient across the skin
Q. Regarding body temperature:
a. humans are poikilothermic
b. oral temperature is usually higher than rectal temperature
c. it is usually lowest at 6am
d. children have more precise temperature regulation
e. emotion has no effect on core temperature
Q. Regarding the hypothalamus:
a. it has neural connections with the anterior pituitary gland
b. it integrates the vomiting reflex
c. the anterior hypothalamus responds to cold
d. it controls circadian rhythms via the supraoptic nuclei
e. it has osmoreceptors in the anterior hypothalamus to stimulate thirst and vasopressin release
Q. Regarding the vomiting reflex, which is INCORRECT?
a. it is integrated by the medilla
b. breath is held in expiration
c. the glottis closes
d. it involves salivation
e. there are afferents from vestibular nuclei
Q. Herring bodies are:
a. nuclei of the hypothalamus
b. secretory granules in the posterior pituitary
c. circumventricular organs
d. neurons connecting vestibular nuclei with the vomiting centre
e. vesicles containing ACTH, TSH, GH, FSH, CH and PRL
Q. The neurotransmitter secreted by primary afferent fibres for severe pain is:
a. glutamate
b. acetylcholine
c. substance P
d. opioid peptides
e. noradrenaline
Q. Regarding rods and cones:
a. Na+ channels are closed in the dark
b. light striking the outer segments results in a depolarising receptor potential
c. the receptor potentials are all-or-nothing
d. rhodopsin is a serpentine receptor
e. acetylcholine is released from the synaptic terminal
Q. The visual cortex is situated at the:
a. parieto-occipital sulcus
b. cuneus
c. calcanine fissure
d. lateral geniculate body
e. angular gyrus
Q. In the visual pathway:
a. the lateral geniculate bodies are made up of t layers
b. fibres for reflex pupillary constriction leave the optic nerve at the optic chiasm
c. pituitary tumours can cause homonymous hemianopia
d. macular sparing may or may not occur with lesions in the geniculocalcanine tract
e. binasal visual field fibres decussate at the opticchiasm
Q. When a normal innervated skeletal muscle is stretched, the initial response is contraction, but with increasing stretch, the muscle suddenly relaxes because:
a. with strong stretch, the efferent discharge is decreased
b. with strong stretch, the discharge from the annulospiral endings of afferent nerve fibres is inhibited
c. with strong stretch, there is decreased activity in the afferent nerve fibres from the Golgi tendon organs
d. with strong stretch, there is increased activity in the afferent nerve fibres from the Golgi tendon organs
e. because of reciprocal innervation, there is increased discharge in the afferent nerve fibres from the antagonists to the stretched muscle
Q. In a polysynaptic reflex, which of the following happen when the strength of the adequate stimulus is increased?
a. the amplitude of the motor response is increased
b. the motor response spreads to include other muscles and even other limbs
c. there is increased inhibition of stretch reflexes
d. the duration of the motor response increases
e. all of the above are true
Q. A tumour causing external compression to the anterior cervical spinal cord would beexpected to:
a. impair pressure and pain sensation mostly from sacral and lumbar areas
b. impair fine touch and vibration mostly from sacral and lumbar areas
c. impair pain only from cervical areas
d. impair vibration sense only from cervical areas
e. impair joint position from sacral areas only
Q. Which of the following need to be intact for normal stereognosis:
a. dorsal columns
b. parietal lobe
c. pressure pathways
d. all of the above
e. none of the above
Q. Bitemporal hemianopia is most likely to be caused by a lesion at the:
a. optic nerve
b. optic chiasm
c. optic tract
d. optic radiation
e. visual cortex