medical MCQs – Page 253

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 Review each marked answer and report any item that may be outdated or unclear.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

5041. Distribution of blood flow is mainly regulated by the________________?
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A. Venules

B. Capillaries

C. Arteries

D. Arterioles

5042. Effect on force of contraction of heart is_____________?
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A. Dromotropic effect

B. Ionotropic effect

C. Chronotropic effect

D. Bathmotropic

5043. Sensory receptors for pain are_______________?
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A. Free nerve endings

B. End bulbs of Krause

C. End organs of Ruffini

D. Pacinian corpuscles

5044. Which sensation is not lost on the side of lesion in brown sequard syndrome ?
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A. Touch

B. Muscle sense

C. Vibration sense

D. Temperature

5045. Peripheral resistance is maximum in_______________?
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A. Artery

B. Arteriole

C. Aorta

D. Vein

5046. The ventricular repolarization in ECG is best seen in_______________?
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A. Q wave

B. R wave

C. P wave

D. T wave

5047. Respiratory center is situated in_______________?
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A. Hypothalamus

B. Midbrain

C. Medulla oblongata

D. Spinal cord

5048. Group B fibers are present in_____________?
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A. Intrafusal fibers of the muscle spindle

B. Spinothalamic tracts

C. Golgi tendon apparatus

D. Autoonomic preganglionic fibers

5049. Absolute period when whole heart is in diastole is______________?
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A. 0.3 seconds

B. 0.7 seconds

C. 0.7 seconds

D. 0.4 seconds

5050. Stimulation of baroreceptors results in_______________?
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A. Increase in heart rate

B. Decreased vagal discharge

C. Decrease in blood pressure

D. Increased sympathetic discharge

5051. Neurotransmitter in nigrostrial pathway is_______________?
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A. GABA

B. Acetyl choline

C. Nor epinephrine

D. Dopamine

5052. Aphasia is most likely associated with a lesion in_______________?
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A. Primary motor area

B. Visual area

C. Brocas area

D. Sensory area

5053. The first heart sound is produced by the_____________?
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A. Opening of the aortic and pulmonary valves

B. Closure of the aortic and pulmonary valves

C. Closure of the mitral and tricuspid valves

D. Opening of the mitral and tricuspid valves

5054. Cardiac output is maximum to _________________?
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A. Brain

B. Heart

C. Kidney

D. Liver

5055. Phagocytosis in the CNS is done by _______________?
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A. Oligocytes

B. Astrocytes

C. Microglia

D. Schwann cells

5056. Parasympathetic stimulation of heart causes______________?
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A. Tachycardia

B. SA node decreases firing

C. Increased AV node excitability

D. Decreased ventricular contraction

5057. Stimulation of barorceptor leads to ________________?
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A. Increased B.P, decreased heart rate

B. Decreased B.P, increased heart rate

C. Increased blood pressure, increased heart rate

D. Decreased B.P , decreased heart rate

5058. Absolute refractory period in heart______________?
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A. Corresponds with duration of action potential

B. All of the above

C. Longer than refractory period in skeletal muscle

D. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus

E. Lasts till cardiac contraction

5059. The Sensory receptors serving the stretch reflex are classified as___________?
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A. Exteroceptors

B. Proprioceptors

C. Chemo receptors

D. Nociceptors

5060. Following are the changes during accommodation except_______________?
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A. Convergence of eye ball

B. Increase in the anterior curvature of lens

C. Dilatation of pupil

D. Constriction of pupil

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