Question

With the help of a suitable example, describe reflex action.

Answer 1

A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.

Examples:

1. When light acts as a stimulus, the pupil of the eye changes in size.
2. Sudden jerky withdrawal of hand or leg when pricked by a pin.
3. Coughing or sneezing, because of irritants in the nasal passages.
4. Knees jerk in response to a blow or someone stamping the leg.