Physiology MCQs

Page No. 5

Ventricular muscle receives impulses directly from the_______________?


aPurkinje system

✓


bBundle of HIS

✖


cRight and left bundle branches

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dAV node

✖


View Answer Purkinje system

Isovolumetric relaxation ends immediately after________________?


aAV Valve closes

✖


bWhen ventricular pressure falls below aortic pressure

✖


cWhen ventricular pressure falls below atrial pressure

✓


dNone of the above

✖



Heart muscle, true are all except_______________?


aAct as syncytium

✖


bHas multiple nuclei

✓


cHas gap junctions

✖


dHas branching

✖


View Answer Has multiple nuclei

2nd heart sound is characterized by all except______________?


aDue to closure of semilunar valves

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bIs occasionally split

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cHas longer duration than 1st heart sound

✓


dMarks the onset of diastole

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Stimulation of baroreceptors results in_______________?


aIncrease in heart rate

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bDecreased vagal discharge

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cIncreased sympathetic discharge

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dDecrease in blood pressure

✓



Pain is conducted by________________?


aA-alpha fibers

✖


bA-beta fibers

✖


cA-gamma fibers

✖


dA-delta fibers

✓


View Answer A-delta fibers

Pain sensation from the lateral extremities is transmitted by________________?


aSpino thalmamic tract

✓


bDorsal column

✖


cCorticospinal tract

✖


dSpinocerebellar tract

✖


View Answer Spino thalmamic tract

Respiratory center is situated in_______________?


aMedulla oblongata

✓


bSpinal cord

✖


cMidbrain

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dHypothalamus

✖


View Answer Medulla oblongata

Preganglionic parasympathetic fibers are_______________?


aSomatic only

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bParasympathetic

✖


cSympathetic

✖


dCholinergic

✓


View Answer Cholinergic

Sensations of pain from teeth and temperature are carried by_______________?


aCorticospinal tract

✖


bCorticobulbar tract

✖


cLateral spinothalamic tract

✓


dVentral spinothalamic tract

✖



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