Physiology MCQs

Page No. 5

Ventricular muscle receives impulses directly from the_______________?


aPurkinje system


bBundle of HIS


cRight and left bundle branches


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


bIs occasionally split


cHas longer duration than 1st heart sound


dMarks the onset of diastole



Stimulation of baroreceptors results in_______________?


aIncrease in heart rate


bDecreased vagal discharge


cIncreased sympathetic discharge


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


dHypothalamus


View Answer Medulla oblongata

Preganglionic parasympathetic fibers are_______________?


aSomatic only


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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