Physiology MCQs

Page No. 26

In myasthenia gravis_______________?


a there is lack of acetyl choline

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bLack of acetyl choline receptors

✓


cThere is isometric contraction

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dMuscles are rigid and tough

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The neuromuscular transmitter released at neuromuscular junction is_______________?


aDopamine

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bEpinephrine

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cNor epinephrine

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dAcetylcholine

✓


View Answer Acetylcholine

A motor unit is made up of______________?


aA flexor muscle and an extensor muscle

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

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cA single motor neuron and all the muscle fibers it innervates

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

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Non true regarding Na/K pump is______________?


aPumps Na against a gradient

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b5 Na+ exchanged for 2K+

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cIncrease in intracellular Na

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dHypocalcemia inhibits the pump

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Succinyl choline acts to block neuromuscular transmission by_______________?


aInhibiting cholinesterase

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bInhibiting the CNS

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cDepolarizing the motor end plate of skeletal muscle

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dBlocking the release of acetyl choline at the end plate

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


aLaryngeal muscles

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bPharyngeal muscles

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cMuscles of middle ear

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dExtraocular muscles

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View Answer Laryngeal muscles

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


aAdaptation

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bAccommodation

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cRefractoriness

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dElectrotonus

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View Answer Accommodation

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


aInsufficient neurotransmitter

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bDepletion of intracellular Na+

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cInactivation of Na+ k+ ATPase

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dVoltage inactivation of the Na+ channel

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Two major types of muscle fibres are found in humans_____________?


awhite and brown

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bWhite and yellow

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cWhite and gray

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dWhite and red

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View Answer White and red

The main types of muscle cells are______________?


aSkeletal and cardiac

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bSmooth and cardiac

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cSmooth and skeletal

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dAll of the above

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View Answer All of the above

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