All Free Physiology MCQs with Answers

• A. Motor areas of cerebral cortex
• B. Basal ganglia complex
• C. Pathways for recurrent collateral inhibition in the spinal cord
• D. Anterior hypothalamus

Explanation: Chorea and athetosis are hyperkinetic movement disorders caused by dysfunction of the basal ganglia circuits, which normally help regulate…

• A. Touch
• B. Temperature
• C. Muscle sense
• D. Vibration sense

Explanation: A hemisection of the spinal cord causes ipsilateral loss of vibration, position and fine touch, while pain and temperature are lost on the…

• A. Schwan cell mitosis
• B. Axonal sprouting
• C. Nuclear disintegration
• D. Myelin sheath degeneration

Explanation: After a nerve is cut, the distal axon and its myelin undergo Wallerian degeneration, with myelin breakdown occurring before Schwann-cell…

• A. Nuclear bag intrafusal fibers
• B. Nuclear chain
• C. Golgi tendon organ
• D. Pacinium corpuscles

Explanation: The primary endings of nuclear bag intrafusal fibres are especially sensitive to the rate of muscle stretch, producing the dynamic…

• A. Disintegrating of Nucleus
• B. Disappearance of nissel granules
• C. Disintegration of golgi apparatus
• D. Decrease in cell size

Explanation: Chromatolysis is the loss or dispersal of Nissl bodies in a neuron after axonal injury, accompanied by swelling of the cell body.

• A. Schwann cells
• B. Astrocytes
• C. Oligodendrocytes
• D. Microglia

Explanation: Oligodendrocytes form myelin around axons in the CNS, with one cell capable of myelinating segments of several axons.

• A. Lateral walls
• B. Nasal septum
• C. Lateral wall and nasal septum above superior concha
• D. None of the above

Explanation: Olfactory receptors lie in the olfactory epithelium at the roof of the nasal cavity, including the upper nasal septum and the lateral wall…

• A. Midbrain
• B. Hypothalamus
• C. Cerebrum
• D. Pons

Explanation: The hypothalamus is the major integrating centre for autonomic activity, linking visceral control with endocrine and behavioural…

• A. Intrafusal fibers of the muscle spindle
• B. Golgi tendon apparatus
• C. Autoonomic preganglionic fibers
• D. Spinothalamic tracts

Explanation: Group B fibres are small, myelinated fibres that include autonomic preganglionic axons.

• A. Medulla
• B. Precentral gyrus
• C. Diencephalon
• D. Hypothalamus

Explanation: The hypothalamus maintains body temperature by comparing thermal input with a set point and activating heat-loss or heat-production…

• A. Babinsky test
• B. Weber's test
• C. Finger - nose test
• D. Chvostek test

Explanation: Weber's test uses a tuning fork placed on the midline of the skull to compare sound lateralisation and is useful for detecting conductive…

• A. Trigeminal nerve ganglion
• B. Otic ganglion
• C. Geniculate ganglion
• D. Superior cervical ganglion

Explanation: Taste fibres from the anterior two-thirds of the tongue travel with the chorda tympani branch of the facial nerve, whose sensory cell…

• A. Temporal lobe
• B. Stria nigra
• C. Frontal lobe
• D. Hypothalamus

Explanation: The hypothalamus contains feeding centres that regulate hunger and satiety, classically described as a lateral hunger centre and a…

• 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.