Top 150+ Solved Nervous System MCQ Questions Answer

a. the anterior hypothalamus contains temperature sensitive cells

b. shivering is activated by the posterior hypothalamus

c. the anterior hypothalamus controls mechanisms activated by heat

d. horripilation acts to increase heat production

e. fever is produced by the action of cytokines on the hypothalmus

a. the image becomes more clearly focused

b. there is adaptation in the visual cortex

c. the discharge rate in the bipolar cells increases

d. the pupils constrict

e. the image fades and disappears

a. cataracts

b. vitamin A deficiency

c. astigmatism

d. contrast between stimulus and background

e. all of the above

a. is activated by foreign bodies in the external auditory canal

b. results in vertigo

c. is activated by high-pitched sounds only

d. results in the decreased transmission of sound

e. none of the above

a. caudate nucleus

b. cuneate nucleus

c. substantia nigra

d. putamen

e. globus pallidum

a. peripheral afferents are transmitted along A (delta) and C fibres

b. an intact cerebral cortex is necessary for pain sensation

c. the synaptic transmitter released by primary afferent fibres subserving pain is substance P

d. afferent fibres subserving pain sensation from viscera reach the CNS by both sympathetic and parasympathetic pathways

e. the sensory organs for pain are marked nerve endings

a. dysmetria

b. scanning speech

c. lead pipe rigidity

d. rebound phenomenon

e. dysdiadockokinesia

a. spinal cord

b. medulla

c. mid-brain

d. subcortical nuclei

e. all above intact but decerebellate

a. is initiated by efflux of Na+

b. is terminated by efflux of K+

c. declines in amplitude as it moves along the axon

d. results in transient reversal of the concentration (?electrical) gradient of Na+ across the cell membrane

e. is not associated with any net movement of Na+ of K+ across the cell membrane

a. releasing Ca2+ after an action potential

b. sliding on actin to produce shortening

c. binding to myosin during contraction

d. acting as a “relaxing protein” at rest by covering up the sites where myosin binds to actin

e. generating ATP which passes to the contractile mechanism

a. it does not have a reflex arch like the somatic nervous system

b. it has dopamine as the main transmitter

c. it has cholinergic division which increases activity of the intestinal musculature and increases gastric excretion

d. neurotransmitter noradrenaline is metabolised by pseudocholinesterase

e. it is not onvolved with visceral sensation (?involved)

a. atrial natriuretic peptide

b. cortisol

c. thyroxine

d. aldosterone

e. retinoic acid

a. binding of acetylcholine to nicotinic receptors

b. increased Na+ and K+ conductance in end plate membrane

c. spread of depolarisation along T tubules

d. binding of calcium to troponin T, with uncovering of its actin-myosin binding site

e. CTP (cytidine triphosphate)

a. membrane permeability of potassium ions via K+ leak channels produces the resting potential

b. a decrease in extracellular Ca2+ decreases excitability

c. decreasing external Na+ concentration lowers the resting membrane potential

d. changing the external Na+ concentration has no effect on the action potential

e. decreasing the external K+ concentration increases the resting membrane potential

a. calcium ions bind to troponin T

b. troponin I – tropomyosin complex constitutes a “relaxing protein”

c. each cycle of attachment and detachment shortens muscle length by about 1%

d. ATP is the immediate source of energy

e. globular head of myosin – II possesses actin binding site