Biology MCQs

Page No. 45

Central nervous system of man consists of______________?


aBrain


bSpinal cord


cBoth of these


dnone of these


View Answer Both of these

Which of the following ions are involved in the initiation of nerve impulse_______________?


aNa+


bK+


cFe


dnone of these


View Answer Na+

Under resting membrane potentials:


aOuter surface of neuron is more positive


bInner surface of neuron is more positive


cBoth of these surfaces are equally positive


dnone of these.



What is the function of synapse________________?


aTo allow nerve impulse to move in backward direction


bTo decrease the speed of nerve impulse


cTo stop the nerve impulse


dTo provide cytoplasmic connection between neurons.



Microscopic gaps between the neuron endings are called__________?


aTransmitters


bSynapses


cPores


dNodes


View Answer Synapses

Which of the following cytoplasmic extensions carry the message toward the cell body___________?


aDendrites


bAxon


cBoth of these


dnone of these


View Answer Dendrites

Which of the following neuron has a single long dendron?


aSensory neuron


bMotor neuron


cAssociative neuron


dnone of these


View Answer Sensory neuron

In which of the following neurons length of dendrite is greater than axon_______________?


aSensory neuron


bMotor neuron


cAssociative neuron


dnone of these


View Answer Sensory neuron

Which of the following transmits nerve impulse from receptors to central nervous system?


aSensory neuron


bMotor neuron


cAssociative neuron


dnone of these


View Answer Sensory neuron

Which of the followings is missing from the nervous system of planaria_____________?


aGanglia


bLongitudinal nerves


cLateral nerves


dnone of these


View Answer none of these

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