medical MCQs – Page 255

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 Review each marked answer and report any item that may be outdated or unclear.

5081. Hunger centre of brain is________________?
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A. Stria nigra

B. Hypothalamus

C. Frontal lobe

D. Temporal lobe

5082. The cell junctions allowing exchange of cytoplasmic molecules between two cells are called________________?
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A. Tight junctions

B. Gap junctions

C. Focal junctions

D. Anchoring junctions

5083. Epicrritic perception of pain occurs at the level of______________?
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A. Pulvinar

B. Area 3,1,2

C. Thalamus

D. Areas 5,7

5084. The first physiological response to high environmental temperature is_______________?
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A. Sweating

B. Non- shivering thermogenesis

C. Vasodilatation

D. Decrease heat production

5085. 2nd heart sound is characterized by all except______________?
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A. Is occasionally split

B. Marks the onset of diastole

C. Due to closure of semilunar valves

D. Has longer duration than 1st heart sound
5086. Blood brain barriers is absent in all of the following areas except__________________?
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A. Area posterma

B. Habenuclear trigone

C. Neurohypophysis

D. Subfornical region

5087. Cardiac index is related to ______________?
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A. Stroke volume and pulse rate

B. cardiac output and body weight

C. Cardiac output and work of the heart

D. Cardiac output and body surface area
5088. Swallowing center is situated in_______________?
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A. Pons

B. MIdbrain

C. Cerebellum

D. Medulla
5089. Middle ear deafness can be tested by_____________?
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A. Babinsky test

B. Finger nose test

C. Webers test

D. Chvostek test

5090. which receptor is responsible for monitoring the rate of muscle stretch ?
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A. Pacinium corpuscles

B. Nuclear bag intrafusal fibers

C. Golgi tendon organ

D. Nuclear chain

5091. Coronary blood flow is usually predominantly controlled by_____________?
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A. Auto regulation

B. Parasympathetic impulses

C. Sympathetic impulse

D. Hormones

5092. Which of the following is not true about axonotmesis ?
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A. Impairment of both sensory and motor function

B. Wallerian degeneration

C. Intact neural sheath is not present

D. Reversible loss, which will be regenerated i 6-8 wks

5093. Satiety center in hypothalamus is regulated by ________________?
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A. Blood glucose levels

B. All of the above

C. Gastric dilatation

D. Blood insulin levels

5094. Pain sensation from the lateral extremities is transmitted by________________?
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A. Spino thalmamic tract

B. Spinocerebellar tract

C. Dorsal column

D. Corticospinal tract

5095. Starlings law of the heard________________?
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A. Explains the increase in cardiac output that occurs when venous return is increased

B. Does not operate in the failing heart

C. Does not operate during exercise

D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

5096. Which of the following increases turbulence in blood flow ?
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A. Decrease in velocity of blood

B. Reynolds number < 2000

C. Increase in diameter of blood vessel

D. Decrease in density of blood

5097. Intention tremor is a feature of _______________?
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A. Loss of function of Hypothalamus

B. Loss of function of cerebellum

C. Loss of function of Thalamus

D. Loss of function of Basal ganglia

5098. First heart sound occurs during the period of________________?
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A. Isovolumetric contraction

B. Isovolumetric relaxation

C. Isotonic contraction

D. Isotonic relaxation

5099. SA node acts as a pacemaker of the heart because of the fact that it_________________?
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A. Has poor cholinergic innervation

B. Has rich sympathetic innervation

C. is capable of generating impulses

D. Generates impulses at the highest rate
5100. Axon hillock is part of the soma of neuron which________________?
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A. Has dense Nissl grandules

B. Has no Nissl granules

C. Is at commencement of dendrites

D. Is round in shape