Free Neurophysiology MCQs with Answers

• A. A-delta fibersConsult Online Doctors
• B. A-beta fibers
• C. A-gamma fibers
• D. A-alpha fibers

Explanation: A-delta fibres are thinly myelinated and carry fast, sharp pain, whereas unmyelinated C fibres carry slow, dull pain.

• A. Constriction of pupil
• B. Convergence of eye ball
• C. Dilatation of pupil
• D. Increase in the anterior curvature of lens

Explanation: Accommodation for near vision combines pupillary constriction, medial convergence of the eyes, and increased anterior lens curvature.

• A. None of the aboveGet Study Guides
• B. Jaw clenching reflex
• C. Jaw gnashing reflex
• D. Jaw opening reflex

Explanation: Stimulation of oral mechanoreceptors or nociceptors initiates the protective jaw-opening reflex, which helps prevent injury or remove an…

• A. Has no Nissl granules
• B. Has dense Nissl grandules
• C. Is at commencement of dendrites
• D. Is round in shape

Explanation: The axon hillock is the trigger zone where the axon begins and where action potentials are commonly initiated.

• A. Habenuclear trigone
• B. Subfornical region
• C. Area posterma
• D. Neurohypophysis

Explanation: The subfornical organ, area postrema, and neurohypophysis are circumventricular regions with an absent or highly reduced blood-brain…

• A. Thalamus
• B. Areas 5,7
• C. Area 3,1,2
• D. Pulvinar

Explanation: Epicritic or discriminative sensory perception is analysed in the primary somatosensory cortex, comprising Brodmann areas 3, 1, and 2.

• A. Loss of function of Thalamus
• B. Loss of function of Hypothalamus
• C. Loss of function of Basal ganglia
• D. Loss of function of cerebellum

Explanation: Intention tremor becomes more prominent as a voluntary movement approaches its target, which is characteristic of cerebellar dysfunction.

• A. Less than 3.5 cycles per second
• B. Between 8 and 13 cycles per second
• C. More than 14 cycles per second
• D. Between 4 and 7 cycles per second

Explanation: Delta waves are the slowest EEG waves, typically about 0.5 to 3.5 cycles per second and prominent in deep sleep.

• A. Pacinian corpuscles
• B. Free nerve endings
• C. End bulbs of Krause
• D. End organs of Ruffini

Explanation: Pain receptors are free nerve endings, usually carried by A-delta or C fibres and activated by damaging mechanical, thermal, or chemical…

• A. Proprioception
• B. Melanophage
• C. Chemoreceptor
• D. Tactile sensation

Explanation: Merkel cells are slowly adapting cutaneous mechanoreceptors that detect sustained light touch, pressure and texture.

• A. Decibels
• B. Daltons
• C. Diopters
• D. Pounds

Explanation: Sound intensity is expressed in decibels, a logarithmic unit comparing sound power or pressure.

• A. Pain
• B. Pressure
• C. Touch
• D. Temperature

Explanation: Pacinian corpuscles are rapidly adapting receptors for deep pressure and high-frequency vibration.

• A. -55 mv
• B. -90 mv
• C. -70 mv
• D. + 35 mv

Explanation: A typical nerve fibre has a resting membrane potential of about −70 mV, maintained mainly by potassium leak and the sodium-potassium pump.

• A. MIdbrain
• B. Pons
• C. Cerebellum
• D. Medulla

Explanation: The swallowing centre is a medullary pattern-generating network that coordinates the sequential phases of swallowing, with related…

• A. Distal cut end of nerve without cell body
• B. Proximal cut end of nerve with cell body
• C. Both the free ends of the cut nerve
• D. All are true

Explanation: Wallerian degeneration occurs in the distal part of a severed axon, which is disconnected from its cell body and therefore loses trophic…

• A. Myelin degeneration
• B. Axonal degeneration
• C. Mitosis of schwann cell
• D. Sprouting

Explanation: The axon in the distal segment degenerates first after nerve severance, followed by breakdown of its myelin sheath and later Schwann-cell…

• A. Acetyl choline
• B. GABA
• C. Dopamine
• D. Nor epinephrine

Explanation: The nigrostriatal pathway carries dopaminergic projections from the substantia nigra to the striatum and helps regulate movement.

• A. Near sightedness
• B. Far sightedness
• C. Constriction of the pupil
• D. Dilation of the pupil

Explanation: Myopia is short-sightedness: nearby objects are seen clearly, but distant images focus in front of the retina.

• A. Sensory area
• B. Broca's area
• C. Primary motor area
• D. Visual area

Explanation: Broca's area is the dominant frontal speech area, and its lesion causes expressive or motor aphasia with impaired speech production.

• A. fibers
• B. fibers
• C. Sympathetic fibers
• D. Parasympathetic fibers

Explanation: Visceral pain from abdominal organs generally travels with sympathetic afferent fibers, entering the spinal cord through dorsal roots and…