Question

Give the charecterstics of nerves fibers

Answer 1

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Properties of nerve fibres :

a. Excitability/Irritability -

The nerve fibres, on account of presence of a polarised membrane, have the ability to perceive stimulus and enter into a state of activity.

b. Conductivity -

It is ability to transmit the excitation.

c. Stimulus -

It is any detectable, physical, chemical, electrical change in the external or internal environment which brings about excitation in a nerve/muscle/organ/organism. In order to be effective, the stimulus must have a minimum intensity called threshold stimulus. Subliminal (weak) stimulus will have no effect while supraliminal (strong) stimulus will produce the same degree of impulse as the threshold stimulus.

d. Summation effect -

A single subliminal stimulus will have no effect but if many such weak stimuli are given in quick succession, they may produce an impulse due to addition or summation of stimuli.

e. All or none law -

The nerve will either conduct the impulse along its entire length or will not at all conduct the impulse, as in case of subliminal or weak stimulus.

f. Refractory period -

It is the time interval (about millisecond) during which a nerve fails to respond to a second stimulus however strong it is.

g. Synaptic delay -

The impulse requires about 0.3 to 0.5 milliseconds to cross a synapse. This time is required for release of neurotransmitter from the axon terminal and excitation in the dendron of the next neuron.

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Answer 2

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