Physiology MCQs

Page No. 27

Upstroke of action potential would lead to________________?


aNet current in an outward direction

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bCell interior becomes more negative

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cCell interior becomes less negative

✓


dNone of the above

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


aInhibitory post synaptic potential

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bMiniature end plate potential

✓


cAction potential

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dEnd plate potential

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Cardiac muscle contracts due to______________?


aExtracellular Ca+2

✓


bSarcoplasmic ca+2

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cExtracellular Na+

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dIntracellular Na+

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View Answer Extracellular Ca+2

Skeletal muscles_____________?


aContracts when calcium is taken up by sarcoplasmic reticulum

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bContracts when actin and myosin filaments shorten

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cContraction is initiated by calcium binding to troponin

✓


dContraction is initiated by calcium binding to tropomyosin

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


aTroponin

✓


bMyosin

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cActin

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dProtein- C

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View Answer Troponin

Which is caused by acetylcholine through nicotinic receptors_____________?


aContraction of skeletal muscle

✓


bDecrease of heart rate

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cSecretion of saliva

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dContraction of pupils

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The contractile element in a skeletal muscle is present in______________?


aSarcolemma

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bSarcoplasm

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cMyofibril

✓


dEndomysium

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View Answer Myofibril

Electromyography is used for________________?


aTo study muscle activity

✓


bDetermine class II malocclusion

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cDetermine the centric relation

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dDetermine the centric occlusion

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The skeletal muscle action potential______________?


aIs not essential for contraction to occur

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bHas a prolonged plateau phase?

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

✓


dBegins with an, in ward movement of K+ ins

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Rigor mortis results after death is due to________________?


aFailure of acetylcholine to diffuse

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bFailure of ATP supply

✓


cFailure of break down of calcium bridges

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dNone of the above

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View Answer Failure of ATP supply

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