Generation and Conduction of Nerve Impulse

IMPORTANT

Generation and Conduction of Nerve Impulse: Overview

This Topic covers sub-topics such as Neurons, Neurotransmitters, Nerve Impulse, Nerve Fibres, Conduction of Nerve Impulse, Synaptic Knob, Resting Potential, Generation of Nerve Impulse and, Transmission of Impulse at a Synapse

Important Questions on Generation and Conduction of Nerve Impulse

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 1

When a stimulus is applied at a site over neuron membrane

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 2

The function of part A seen in the figure is:

Question Image

 

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 3

Two neurons, A and B, synapse onto a third neuron, C. If neurotransmitter from A opens ligand-gated channels permeable to Na+ and K+ and neurotransmitter from B opens ligand-gated Cl- channels, which of the following statements is true?

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 4

During repolarization of membrane of neuron, which ion is most permeable ?

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 5

Resting membrane potential of a neuron is approximately

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 6

Which event causes depolarisation of a neuron?

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 7

Mark the incorrect statement with respect to resting membrane potential:

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 8

Read the statements and find the correct option:

I. Resting the axonal membrane is almost impermeable to Na-ions and K-ions.

II. A polarised membrane, upon receiving the stimulus, becomes depolarised, and rapid efflux of NA-ion takes place.

III. The duration of stimulus-induced change of permeability for NA-ion is very short-lived.

IV. Repolarisation occurs only when there is an efflux of K-ions.

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 9

Once a synaptic junction between neurons has allowed transmission of a nerve impulse, it is made ready to transmit next impulse by the action of:

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 10

Which of these fibres release epinephrine?

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 11

Which diagram shows the distribution of Na+ and K+ ions in a section of non-myelinated axon which is at resting potential?

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 12

Choose the correct diagram which represent the flow of information through the nervous system

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 13

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 14

Sodium- potassium pump is

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 15

All sensory pathways to the cerebral cortex synapse at the:

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 16

Depolarization of a stimulated nerve is maintained by:

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 17

The release of chemical messenger from synaptic vesicles is under the influence of these ion(s)

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 18

Which option is correct for the correctly matched groups for column I, column II and column III?

  Column I Column II   Column III
(a) Resting membrane potential i. Na+ channel open e. Na+ and K+ pumps are responsible for it
(b) Action potential ii. Na+ channel is closed f. Last for a very short time
(c) Depolarization iii. Na+ ions are more on the outer side g. K+ ions move on the outer side of the membrane
(d) Repolarization iv. Na+ ions are more on the inner side of the membrane h. The positive charge on the inner side of the membrane

 

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 19

An investigator places an isolated neuron in a calcium free medium, gives the neuron a suprathreshold stimulus and then performs an assay to test whether neurotransmitter is released into the medium. Which of the following outcomes would you predict

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biology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse> Q 20

The chemical causing the transmission of nerve impulse across synapses is Or The neurotransmitter which communicates between two neurons or between a neuron and a muscle is