Q.Explain the properties of nerve fibre with reference to:

Irritability is the property of a nerve fibre to perceive/respond to a stimulus by generating a nerve impulse (action potential) when stimulated above threshold. Conductivity is the property of a nerve fibre to transm...

Irritability lets a neuron generate an impulse on stimulation; conductivity lets it transmit that impulse along its length.

Nerve fibres (axons) possess two fundamental physiological properties that allow the nervous system to function:

(a) Irritability (excitability): This is the inherent capacity of a nerve fibre's membrane to respond to a stimulus (chemical, electrical, mechanical, thermal, etc.) that exceeds a certain threshold intensity, by undergoing a change in membrane potential — depolarization — and generating a nerve impulse (action potential). Below threshold, no impulse is generated (all-or-none principle); the stimulus must be strong enough to trigger this response. …