Nerve fibres (axons) transmit nerve impulses due to specific properties:
1. Excitability: Ability to respond to stimuli (e.g., chemical, electrical) by generating action potentials.
2. Conductivity: Ability to propagate action potentials along the axon without decrement.
3. All-or-none response: An action potential is triggered only if the stimulus reaches threshold; its strength is constant.
4. Refractory period: Time after an action potential during which the fibre cannot (absolute) or is less likely to (relative) respond to a new stimulus.
5. Summation: Temporal (rapid successive stimuli) or spatial (multiple stimuli) summation can trigger an action potential.