Question

What is the funtion of reflex arc?

Answer 1

a stimulus is detected by a receptor cell, which synapses with a sensory neurone.
- The sensory neurone carries the impulse from site of the stimulus to the central nervous system (the brain or spinal cord), where it synapses with an interneurone.
- The interneurone synapses with a motor neurone, which carries the nerve impulse out to an effector, such as a muscle, which responds by contracting.

The neural path of a reflex is called reflex arc.

Answer 2

This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain, although the brain will receive sensory input while the reflexaction occurs. Most reflex arcs involve only three neurons.