medical MCQs – Page 252

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

5021. Wallenberg degeneration is seen in______________?
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A. Proximal cut end of nerve with cell body

B. Distal cut end of nerve without cell body

C. Both the free ends of the cut nerve

D. All are true

5022. function of Merkels cells is_______________?
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A. Melanophage

B. Chemoreceptor

C. Tactile sensation

D. Proprioception

5023. Isovolumetric relaxation ends immediately after________________?
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A. When ventricular pressure falls below atrial pressure

B. None of the above

C. When ventricular pressure falls below aortic pressure

D. AV Valve closes

5024. Tissues with least regenerative potential is________________?
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A. Nerve

B. None of the above

C. Skin

D. Cardiac muscle

5025. Pain producing substance is________________?
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A. Substance P

B. Acetyl choline

C. Serotonin

D. Histamine

5026. Sensations of pain from teeth and temperature are carried by_______________?
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A. Corticospinal tract

B. Ventral spinothalamic tract

C. Lateral spinothalamic tract

D. Corticobulbar tract

5027. Following are extrapyramidal tracts except______________?
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A. Corticospinal

B. Vestibulospinal

C. Rubrospinal

D. Reticulospinal

5028. Which of the following acts as a neurotransmitter inhibitor _______________?
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A. GABA

B. Aspartic acid

C. Glutamate

D. Lysin

5029. Closure of aortic valve occurs before the following event_______________?
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A. Isovolumetric contraction

B. Pre-diastole

C. Pre-systole

D. Isovolumetric relaxation

5030. Which of the following coagulation factors is deficient in classical hemophilia ?
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A. IX

B. XII

C. X

D. VIII

5031. The effects of Adrenaline on heart are all except__________________?
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A. Increases heart rate

B. Increases oxygen uptake by heart

C. Increases force of contraction

D. Decreases myocardial irritability

5032. Consider the following statements________________?
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A. Starlings law of heart states that increase in force of contraction is directly related to cardiac ouput

B. Stalings law of heart states that the force of ventricular contraction is directly related to the end diastolic volume

C. Both A and B

D. None of the above

5033. Sweat glands are supplied by only_______________?
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A. Motor nerves

B. Sympathetic nerves

C. Sensory nerves

D. Parasympathetic nerves

5034. Which of the following is not true for myelinated nerve fibers______________?
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A. Membrane currents are generated at nodes of Ranvier

B. Impulse through myelinated fibers is slower than non- myelinated fibers

C. Saltatory conduction of impulses is seen

D. Local anesthesia is effective only when the nerve is not covered by myelin sheath

5035. Intensity of sound is measured in________________?
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A. Diopters

B. Daltons

C. Pounds

D. Decibels

5036. Pain is conducted by_______________?
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A. A-beta fibers

B. A-delta fibers

C. A-alpha fibers

D. A-gamma fibers

5037. Heart muscle, true are all except_______________?
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A. Has multiple nuclei

B. Has branching

C. Has gap junctions

D. Act as syncytium

5038. In CNS, the myelination is carried out by _____________?
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A. Oligodendrocytes

B. Schwann cells

C. Microglia

D. Astrocytes

5039. Voluntary movement of eye ball is controlled by______________?
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A. Cerebellum

B. Frontal eye field

C. Superior colliculus

D. Visual cortex area

5040. Pain is conducted by________________?
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A. A-delta fibers

B. A-beta fibers

C. A-alpha fibers

D. A-gamma fibers

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