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 MCQs on CNS and special sense physiology with their answers

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مُساهمةموضوع: MCQs on CNS and special sense physiology with their answers   الخميس أكتوبر 07, 2010 8:16 pm

1) Spinal nerves are
A) purely sensory.
B) purely motor.
C) both sensory and motor.
D) interneuronal.
E) involuntary.

2) The layer of connective tissue that surrounds a fascicle within a peripheral nerve is the
A) perineurium.
B) epineurium.
C) endoneurium.
D) epimysium.
E) endosteum.

3) A highly sensitive tactile receptor composed of dendritic processes of a single myelinated fiber that makes contact with specialized cells of the stratum basale is a
A) lamellated corpuscle.
B) tactile (Meissner) corpuscle.
C) Ruffini corpuscle.
D) tactile (Merkel) disc.
E) root hair plexus.

4) The area of the motor cortex that is devoted to a particular region of the body is proportional to the
A) size of the body area.
B) distance of the body area from the brain.
C) number of motor units in that region.
D) number of sensory receptors in the area of the body.
E) size of the nerves that serve the area of the body.


5) In order for a sensation to become a perception,
A) it must received by the somatosensory cortex.
B) the individual must vocalize about it.
C) it must arrive over fast-conducting nerve fibers.
D) the other senses must be silent.
E) it must received by the pulvinar nucleus of the thalamus.

6) A receptor potential may
A) increase neurotransmitter release.
B) decrease neurotransmitter release.
C) be a hyperpolarization.
D) be a depolarization.
E) be any of the above

7) Pain is to ________ as cold is to ________.
A) nociceptors; thermoreceptors
B) baroreceptors; chemoreceptors
C) baroreceptors; nociceptors
D) chemoreceptors; nociceptors
E) baroreceptors; thermoreceptors

Cool Which of the following is true of the vascular tunic of the eye?
A) provides a route for blood vessels and lymphatics that supply tissues of the eye
B) regulates the amount of light entering the eye
C) secretes and reabsorbs the aqueous humor
D) controls the shape of the lens
E) all of the above

9) The space between the iris and ciliary body and the lens is the
A) anterior chamber.
B) posterior chamber.
C) pupil.
D) posterior cavity
E) B and D

10) The shape of the lens is controlled by the
A) pupillary sphincter muscles.
B) pupillary radial muscles.
C) ciliary muscles.
D) iris.
E) A, B, and C

11) In the human eye, most refraction occurs when light passes through the
A) iris.
B) cornea.
C) lens.
D) aqueous humor.
E) vitreous humor.







12) The ciliary muscle contracts to
A) control the amount of light reaching the retina.
B) adjust the shape of the lens for distant vision.
C) adjust the shape of the lens for near vision.
D) control the production of aqueous humor.
E) adjust the shape of the cornea and vitreous.

13) Which of the following statements concerning vision is false?
A) Approximately half of the fibers in each optic nerve cross to opposite sides of the brain at the optic chiasm.
B) Fibers of the optic nerve synapse at the thalamus.
C) Optic tracts are found after the optic chiasma.
D) The visual cortex of the brain is located in the frontal lobe.
E) Cone cells are better for color vision and visual acuity.

14) The auditory ossicles connect the
A) tympanic membrane to the oval window.
B) tympanic membrane to the round window.
C) oval window to the round window.
D) stapedius to the tympanic membrane.
E) otitis to the media.

15) The structure that overlies the organ of Corti is the
A) basilar membrane.
B) tectorial membrane.
C) stapedius.
D) perilymph.
E) endolymph.

16) The sensory receptors of the semicircular canals are located in the
A) saccules.
B) ampullae.
C) perilymph.
D) utricles.
E) cupulas.

17) Static equilibrium depends on
A) changes in the pressure exerted by the cupula on hair cells.
B) vibrations of the tectorial membrane striking hair cells.
C) the force exerted by otoliths on hair cells of the maculae.
D) the movement of endolymph within the semicircular canals.
E) both C and D

18) The frequency of a perceived sound depends on
A) the frequency of stereocilia vibration.
B) the number of hair cells that are stimulated.
C) which part of the cochlear duct is stimulated.
D) the movement of perilymph in the cochlear duct.
E) the frequency of vibration of the tectorial membrane.






19) The following is a list of the steps that occur in the production of an auditory sensation.

1. The pressure wave distorts the basilar membrane on its way to the round window.
2. Movement of the tympanic membrane causes displacement of the malleus.
3. Displacement of the stereocilia stimulates sensory neurons of the cochlear portion of the vestiulocochlear nerve.
4. Movement of the malleus causes movement of the incus and stapes.
5. Distortion of the basilar membrane forces the hair cells of the organ of Corti toward or away from the tectorial membrane.
6. Movement of the oval window establishes pressure waves in the perilymph of the vestibular duct.

The proper sequence for these steps is
A) 2, 4, 1, 6, 5, 3.
B) 2, 4, 6, 3, 5, 1.
C) 2, 1, 4, 6, 5, 3.
D) 2, 4, 6, 1, 5, 3.
E) 2, 5, 4, 6, 1, 3.

20) A ray of light entering the eye will encounter these structures in which order?
A) conjunctiva → cornea → aqueous humor → lens → vitreous body → retina → choroid
B) vitreous body → retina → choroids → aqueous humor → lens → conjunctiva → cornea
C) cornea → aqueous humor → vitreous body → lens → conjunctiva → choroids → retina
D) conjunctiva → cornea → lens → aqueous humor → vitreous body → retina → choroid
E) cornea → aqueous humor → conjunctiva → lens → vitreous body → retina → choroid

21) Pupillary muscle groups are controlled by the ANS. Parasympathetic activation causes pupillary ________, and sympathetic activation causes ________.
A) dilation; constriction
B) dilation; dilation
C) constriction; dilation
D) constriction; constriction
E) vasoconstriction; vasoconstriction

22) When a rod is stimulated by light, all of the following occur EXCEPT
A) the plasma membrane of the rod cell becomes hyperpolarized.
B) the rod cell generates an action potential.
C) less neurotransmitter is released by the rod cell.
D) the bipolar cell is activated.
E) all of the above

23) Under which condition would the release of neurotransmitter by photoreceptors be greatest?
A) under normal room light
B) in a pitch-black room after 30 minutes
C) immediately after going outside in bright sunlight
D) focusing intently on a close object
E) focusing intently on a distant object

24) The round window is connected directly to which passageway?
A) scala tympani
B) external auditory meatus
C) cochlear duct
D) scala vestibuli
E) scala media



25) The statement "there is always a peripheral synapse between the CNS and the effector organ" is
A) true only for the parasympathetic nervous system.
B) true only for the sympathetic nervous system.
C) true for both the parasympathetic and sympathetic nervous systems.
D) not true for either the parasympathetic or sympathetic nervous systems.
E) true only for the somatic nervous system.

26) Preganglionic neurons of the sympathetic nervous system are located in the
A) lateral gray horns of the cervical cord.
B) anterior gray horns of the cervical and thoracic spinal cord.
C) lateral gray horns of segments T1 to L2 of the spinal cord.
D) anterior gray horns of segments T1 to L2 of the spinal cord.
E) lateral gray horns of T1 to S2 of the spinal cord.

27) Clusters of ganglionic sympathetic neurons that innervate organs in the abdominopelvic region are called ________ ganglia.
A) intramural
B) collateral
C) chain
D) paravertebral
E) suprarenal

28) Each of the following effects is associated with the action of postganglionic sympathetic fibers, except
A) increased sweat secretion.
B) reduced circulation to the skin.
C) decreased heart rate.
D) dilation of the pupils.
E) increased blood flow to skeletal muscles.

29) Preganglionic fibers of parasympathetic neurons are present in all of the following cranial nerves, except
A) III.
B) VII.
C) IX.
D) X.
E) XII.

30) The statement "its postganglionic axons always use acetylcholine as the neurotransmitter" is
A) true only for the parasympathetic nervous system.
B) true only for the sympathetic nervous system.
C) true for both the parasympathetic and sympathetic nervous systems.
D) not true for either the parasympathetic or sympathetic nervous systems.
E) true only for the somatic nervous system.

31) Autonomic tone is an important aspect of ANS function because it
A) allows ANS neurons to be silent under normal conditions.
B) allows ANS neurons to increase activity on demand but not decrease their activity.
C) allows ANS neurons to decrease their activity on demand but not increase their activity.
D) allows ANS neurons to increase or decrease their activity, providing a range of control options.
E) provides for a narrow range of control options that keeps target tissues constantly active.





32) Which of the following statements concerning the parasympathetic division of the autonomic nervous system is false?
A) Preganglionic neurons are located in the brain stem and sacral region of the spinal cord.
B) The postganglionic ganglia are within or near to effectors.
C) Preganglionic fibers are relatively short and postganglionic fibers are relatively long.
D) The actions of the parasympathetic division are more localized than those of the sympathetic division.
E) The preganglionic neurons always release acetylcholine.



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عدل سابقا من قبل Admin في الثلاثاء نوفمبر 01, 2011 8:22 pm عدل 2 مرات
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مُساهمةموضوع: Another new link   الأربعاء مارس 30, 2011 7:23 pm

Download link



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مُساهمةموضوع: رد: MCQs on CNS and special sense physiology with their answers   الخميس أبريل 07, 2011 9:20 am

Question 01

Regarding reflexes:
a) a monosynaptic reflex arc involves one or more interneurons.
b) the knee jerk reflex is an example of a stretch reflex.
c) interneurons are the final common path for all reflexes.
d) withdrawal reflexes are lost following cervical section of the spinal cord.

Question 02

Regarding the role of muscle spindles and Golgi tendon organs:
a) muscle spindles measure the tension of skeletal muscle.
b) Golgi tendon organs measure the length of skeletal muscles.
c) muscle spindles receive both afferent and efferent nerve fibers.
d) muscle spindles are only of importance in the regulation of posture.

Question 03

Regarding the descending motor pathways:
a) the axons of the corticospinal tract mainly synapse directly with motoneurons in the spinal cord.
b) the rubrospinal tract exerts its major influence on the muscles of the extremities.
c) the reticulospinal tracts are largely decussated (crossed).
d) damage to the pyramidal tract results in a loss of fine control of the muscles on the same side of the body.

Question 04

Concerning the motor cortex:
a) the motor areas of the cortex are situated in the postcentral gyrus.
b) following a cerebral hemorrhage affecting the precentral gyrus of the right hemisphere, the patient feels no sensation on the left side of their body.
c) the corticospinal tract provides the only connection between the motor cortical areas and the spinal cord.
d) motor areas of the cortex receive somatosensory input via the thalamus.

Question 05

Regarding the role of the cerebellum:
a) Purkinje neurons lie in the deep cerebellar nuclei.
b) the cerebellum has a direct efferent projection to the motor cortex.
c) hemiballismus is a sign of cerebellar damage.
d) the cerebellar hemispheres control and receive inputs from ipsilateral muscles.

Question 06

Regarding the role of the basal ganglia in motor control:
a) disorders of the basal ganglia produce a marked loss of both sensation and motor control.
b) Parkinsonism is caused by neuronal degeneration within the substantia nigra.
c) the globus pallidus projects directly to the cerebral cortex.
d) acetylcholine is the predominant neurotransmitter of the substantia nigra



ANSWERS


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مُساهمةموضوع: More new link   الثلاثاء نوفمبر 01, 2011 8:18 pm

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مُساهمةموضوع: رد: MCQs on CNS and special sense physiology with their answers   الجمعة يونيو 27, 2014 8:06 am

More questions with their answers



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مُساهمةموضوع: رد: MCQs on CNS and special sense physiology with their answers   الخميس يوليو 28, 2016 8:55 am

Online MCQs test on CNS by Dr Khaled A Abulfadle




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MCQs on CNS and special sense physiology with their answers
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