Physiology MCQs

Page No. 26

In myasthenia gravis_______________?


a there is lack of acetyl choline


bLack of acetyl choline receptors


cThere is isometric contraction


dMuscles are rigid and tough



The neuromuscular transmitter released at neuromuscular junction is_______________?


aDopamine


bEpinephrine


cNor epinephrine


dAcetylcholine


View Answer Acetylcholine

A motor unit is made up of______________?


aA flexor muscle and an extensor muscle


bA single skeletal muscle and all the motor peurons that supply it


cA single motor neuron and all the muscle fibers it innervates


dAll the motor neurons in which response are observed after maximal stimulation of a single sensory nerve



Non true regarding Na/K pump is______________?


aPumps Na against a gradient


b5 Na+ exchanged for 2K+


cIncrease in intracellular Na


dHypocalcemia inhibits the pump



Succinyl choline acts to block neuromuscular transmission by_______________?


aInhibiting cholinesterase


bInhibiting the CNS


cDepolarizing the motor end plate of skeletal muscle


dBlocking the release of acetyl choline at the end plate



The number of muscle fibers in a motor unit are least in______________?


aLaryngeal muscles


bPharyngeal muscles


cMuscles of middle ear


dExtraocular muscles


View Answer Laryngeal muscles

Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?


aAdaptation


bAccommodation


cRefractoriness


dElectrotonus


View Answer Accommodation

The absolute refractory period of an action potential is due to _______________?


aInsufficient neurotransmitter


bDepletion of intracellular Na+


cInactivation of Na+ k+ ATPase


dVoltage inactivation of the Na+ channel



Two major types of muscle fibres are found in humans_____________?


awhite and brown


bWhite and yellow


cWhite and gray


dWhite and red


View Answer White and red

The main types of muscle cells are______________?


aSkeletal and cardiac


bSmooth and cardiac


cSmooth and skeletal


dAll of the above


View Answer All of the above

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