Module 1 Exam
30 MCQ35 min
- 1.
Pre-synaptic inhibition is mainly through:
- A.
Release of GABA inhibitory transmitter from the interneuron to inhibit the postsynaptic neuron
- B.
It is mainly by neurotransmitter serotonin
- C.
Inhibitory synaptic knob (of the interneuron) release GABA to inhibit the presynaptic neuron
- D.
None of the above
Correct Answer
C. Inhibitory synaptic knob (of the interneuron) release GABA to inhibit the presynaptic neuron -
- 2.
Inhibitory post synaptic potential (IPSP) is through:
- A.
Increase the permeability of Na ion in the post synaptic membrane
- B.
Increase the influx of K ion and the outflux (efflux) of Cl ion in the post synaptic membrane
- C.
Produces a hyperpolarization state at the post synaptic potential (i.e. more intracellular negativity and more extracellular positivity)
- D.
Acetyl choline is the main neurotransmitter
Correct Answer
C. Produces a hyperpolarization state at the post synaptic potential (i.e. more intracellular negativity and more extracellular positivity) -
- 3.
Regarding excitatory post synaptic potential (EPSP), which of the following is true:
- A.
It is a propagated potential
- B.
It lasts for more than 15 milliseconds
- C.
It leads to complete depolarization
- D.
It increases the neuronal potential and reach the threshold (firing) level
- E.
It increases the excitability of the post synaptic neuron
Correct Answer
E. It increases the excitability of the post synaptic neuron -
- 4.
The sympathetic preganglionic nerve fibers:
- A.
Which supply the abdominal viscera relay in the sympathetic chain.
- B.
Originate at the autonomic ganglia.
- C.
Are myelinated nerve fibers
- D.
Show minimal divergence in the autonomic ganglia.
Correct Answer
C. Are myelinated nerve fibers -
- 5.
The autonomic ganglia all are true except:
- A.
Are relay stations for all preganglionic fibers passing through them.
- B.
Are the site of relay of efferent neurons.
- C.
Function as distributing centers.
- D.
Are located outside the CNS.
Correct Answer
A. Are relay stations for all preganglionic fibers passing through them. -
- 6.
Stimulation of the sympathetic causes :
- A.
Increased gastric HCl and pepsin secretion.
- B.
Generalized actions affecting many systems.
- C.
Bronchoconstriction.
- D.
Decreased glycogenolysis and lipolysis.
Correct Answer
B. Generalized actions affecting many systems. -
- 7.
All the following about the sympathetic N.S. is true except:
- A.
Its stimulation causes urine retention.
- B.
It is involved in stress and emergency conditions.
- C.
It has a V.C. effect on skeletal muscle bld vessels.
- D.
Its stimulation increases the cardiac properties.
Correct Answer
C. It has a V.C. effect on skeletal muscle bld vessels. -
- 8.
The sympathetic tone is most important for :
- A.
Decreasing the blood flow to the gut (GIT or alimentary canal).
- B.
Maintaining the heart rate within normal.
- C.
Keeping the fasting blood glucose level constant.
- D.
Maintenance of the systemic arterial blood pressure constant.
- E.
Causing bronchodilatation.
Correct Answer
D. Maintenance of the systemic arterial blood pressure constant. -
- 9.
The sympathetic system cannot be responsible for:
- A.
Constriction of the pupil.
- B.
Erection of hair.
- C.
Secretion of sweat glands.
- D.
Dilatation of skeletal muscle blood vessels.
- E.
Spleen contraction.
Correct Answer
A. Constriction of the pupil. -
- 10.
Preganglionic sympathetic nerve fibres :
- A.
Are found in somatic nerves (e.g. the median and ulnar nerves).
- B.
Form plexuses around blood vessels.
- C.
Are present in the short ciliary nerves.
- D.
Are non-medullated (non myelinated).
- E.
Are found in the greater splanchnic nerves.
Correct Answer
E. Are found in the greater splanchnic nerves. -
- 11.
Stimulation of the pelvic nerve (sacral autonomic) produces :
- A.
Relaxation of the wall of rectum and contraction of the internal anal sphincter.
- B.
V.C. of the blood vessels in the external genitalia causing erection of penis.
- C.
Contraction of the bladder wall and relaxation of the internal urethral sphincter.
- D.
Contraction of smooth muscles in the male sexual passages causing ejaculation.
- E.
Relaxation of the external urethral and anal sphincters.
Correct Answer
C. Contraction of the bladder wall and relaxation of the internal urethral sphincter. -
- 12.
Concerning the pelvic nerve, all the following is true except:
- A.
It is the nerve of erection (= nervus erigenes).
- B.
It is motor to the urinary bladder and distal half of the large intestine.
- C.
It is inhibitory to both the internal anal and urethral sphincters.
- D.
It has no postganglionic nerve fibres.
Correct Answer
D. It has no postganglionic nerve fibres. -
- 13.
An injury to the first 4 sacral segments of the spinal cord produces :
- A.
Hyperglycaemia.
- B.
V.D. in the cutaneous blood vessels.
- C.
Disturbance of sweat secretion.
- D.
Lack of erection of the penis in males and clitoris in females.
- E.
Relaxation of the internal anal and urethral sphincters.
Correct Answer
D. Lack of erection of the penis in males and clitoris in females. -
- 14.
Which of the following may be produced by parasympathetic stimulation:
- A.
Acceleration of the heart.
- B.
Relaxation of the GIT wall
- C.
V.D. of coronary artery.
- D.
Dilatation of the pupil.
- E.
Contraction of the urinary bladder wall.
Correct Answer
E. Contraction of the urinary bladder wall. -
- 15.
About acetylcholine, all the following is true except:
- A.
It is synthesized & released by some sympath postgang nerve fibres.
- B.
It is the chemical transmitter released by all pregang nerve fibres.
- C.
It is not related to accommodation
- D.
It is liberated by all parasympathetic postganglionic nerve fibres.
Correct Answer
C. It is not related to accommodation -
- 16.
The nicotine-like action of acetylcholine is present in :
- A.
All preganglionic nerve endings.
- B.
The sympathetic postganglionic supply to the blood vessels in skeletal muscles.
- C.
The parasympathetic postganglionic supply to the heart.
- D.
The sympathetic postganglionic supply to the sweat glands.
- E.
The parasympathetic postganglionic supply to the GIT.
Correct Answer
A. All preganglionic nerve endings. -
- 17.
The alpha adrenergic receptors :
- A.
Are not stimulated by epinephrine.
- B.
When stimulated they reduce the gastrointestinal motility.
- C.
Are blocked by propranolol.
- D.
Increase heart rate.
Correct Answer
B. When stimulated they reduce the gastrointestinal motility. -
- 18.
A drug which blocks the beta adrenergic receptors causes :
- A.
Dilatation of the bronchial muscle.
- B.
Relaxation of the sphincters in the alimentary canal.
- C.
Fall in the cardiac output.
- D.
None of the above
Correct Answer
C. Fall in the cardiac output. -
- 19.
The alpha adrenergic receptors mediate all the following except :
- A.
Vasoconstriction.
- B.
Pupil dilatation.
- C.
Spleen contraction.
- D.
Relaxation of intestinal wall.
- E.
Increased cardiac activity.
- F.
Skin hair erection.
Correct Answer
E. Increased cardiac activity. -
- 20.
About receptor potential which of the following is true:
- A.
It obeys the all or none rule.
- B.
It is a form of partial depolarization.
- C.
Its absolute refractory period is too short.
- D.
It is blocked by local anesthetics.
Correct Answer
B. It is a form of partial depolarization. -
- 21.
Regarding the ventral spinothalamic tract, which of the following is not true:
- A.
Its afferent fiber is type C fiber.
- B.
The crossing of the tract to the midline is mainly in the second order neuron.
- C.
It transmits crude touch.
- D.
The main centre of this tract is the thalamus.
Correct Answer
D. The main centre of this tract is the thalamus. -
- 22.
the gracile pathway:
- A.
Transmits unconscious kinesthetic sensation.
- B.
Its afferent is thin slow afferent.
- C.
It runs in the spinal cord medially to the cuneat tract.
- D.
Its transmission is perceived by the thalamus.
Correct Answer
C. It runs in the spinal cord medially to the cuneat tract. -
- 23.
Which of the following is not an unconscious kinesthetic sensation:
- A.
Sense of muscle tone.
- B.
Momentary state of muscle contraction.
- C.
Muscle length.
- D.
Sense of joint movement.
Correct Answer
D. Sense of joint movement. -
- 24.
Regarding cutaneous pain, which of the following is true:
- A.
Fast immediate cutaneous pain is transmitted by paleospinothalameic tract
- B.
Neospinothalamic tract is connected to the reticular formation
- C.
Sever cutaneous pain associated with hypotension
- D.
Lateral spinothalamic tract is specific only for cutaneous pain transmission
Correct Answer
C. Sever cutaneous pain associated with hypotension -
- 25.
about the true visceral pain:
- A.
It is transmitted by somatic nerve fibers.
- B.
Pain from the testis is conducted through dorsal column leminiscus pathway.
- C.
Cardiac pain is conducted through sympathetic nerve fibers.
- D.
It is sharply localized.
Correct Answer
C. Cardiac pain is conducted through sympathetic nerve fibers. -
- 26.
about hyperalgesia which of the following is true:
- A.
The pain receptor is rapidly adapting.
- B.
1ry hyperalgesia is due to central facilitation.
- C.
Secondary hyperalgesia is due to receptor hypersenstivity.
- D.
Area of flare is due to release of histamine from injured area.
Correct Answer
D. Area of flare is due to release of histamine from injured area. -
- 27.
Which of the following is true regarding referred pain:
- A.
Cutaneous pain felt not only in the diseased area but also at a viscus a distance away
- B.
Physiology of referred pain can be explained by dual thalamus supply
- C.
Dermatomal rule can explain referred pain
- D.
None of the above
Correct Answer
C. Dermatomal rule can explain referred pain -
- 28.
Regarding spinal cord gate theory of pain, which is true:
- A.
Inhibitory neuron (which is relaying on the second order neuron of the lateral spinothalamic tract) is tonically inactive
- B.
Stimulation of nearby A myleinated fibers will activate second order neuron of the near spinothalamic pathway by inhibition of the interneuron.
- C.
Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.
- D.
None of the above
Correct Answer
C. Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron. -
- 29.
Regarding brain opiate analgesic system, which is true:
- A.
Descending neuron from brain stem targeting to decrease the release of acetyl choline chemical transmitter from first order neuron (sensory afferent) of lateral spinothalamic tract
- B.
The neuron originating from Raphe nucleus is encephalinergic neuron
- C.
Presynaptic inhibition by the local neuron is by inhibition of exocytosis from presynaptic knob
- D.
Post synaptic inhibition is by maintaining depolarization.
Correct Answer
C. Presynaptic inhibition by the local neuron is by inhibition of exocytosis from presynaptic knob -
- 30.
Regarding Somatosensory cortical areas, which is true:
- A.
Somatosensory area I receives sensory radiation from contralateral thalamus
- B.
Astereognosis occurs due to lesion in somatosensory area I
- C.
Body representation in somatosensory area II is sharply localized
- D.
Somatic sensory association area is not important for perceiving complex sensations
Correct Answer
B. Astereognosis occurs due to lesion in somatosensory area I -
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Jan 08, 2016Quiz Edited by
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