Physiology MCQs

Page No. 27

Upstroke of action potential would lead to________________?


aNet current in an outward direction


bCell interior becomes more negative


cCell interior becomes less negative


dNone of the above



Small packets of acetylcholine released randomly from the nerve cell membrane at rest Produces_______________?


aInhibitory post synaptic potential


bMiniature end plate potential


cAction potential


dEnd plate potential



Cardiac muscle contracts due to______________?


aExtracellular Ca+2


bSarcoplasmic ca+2


cExtracellular Na+


dIntracellular Na+


View Answer Extracellular Ca+2

Skeletal muscles_____________?


aContracts when calcium is taken up by sarcoplasmic reticulum


bContracts when actin and myosin filaments shorten


cContraction is initiated by calcium binding to troponin


dContraction is initiated by calcium binding to tropomyosin



Which one of the following is a regulatory protein of the muscle ?


aTroponin


bMyosin


cActin


dProtein- C


View Answer Troponin

Which is caused by acetylcholine through nicotinic receptors_____________?


aContraction of skeletal muscle


bDecrease of heart rate


cSecretion of saliva


dContraction of pupils



The contractile element in a skeletal muscle is present in______________?


aSarcolemma


bSarcoplasm


cMyofibril


dEndomysium


View Answer Myofibril

Electromyography is used for________________?


aTo study muscle activity


bDetermine class II malocclusion


cDetermine the centric relation


dDetermine the centric occlusion



The skeletal muscle action potential______________?


aIs not essential for contraction to occur


bHas a prolonged plateau phase?


cSpreads in ward to all parts of the muscle via the t- tubule system


dBegins with an, in ward movement of K+ ins



Rigor mortis results after death is due to________________?


aFailure of acetylcholine to diffuse


bFailure of ATP supply


cFailure of break down of calcium bridges


dNone of the above


View Answer Failure of ATP supply

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