What is a reflex are? Explain how it carries the signals from receptor to effectors?

Explanation

A reflex arc is the path through which nerv signals, involved in a reflex action travel. The following flow chart shows the flow of signal in a reflex arc.
Receptor - Sensory Neuron - Relay neuron - Motor neuron -Effectors (muscle)
The receptor is the organ which comes in the danger zone. The sensory neurons pick signal from the receptor and send them to the relay neuron. The relay neuron is present in the spinal cord. The spinal cord sends signals to the effectors via the motor neuron. The effectors take instant action and move the receptor away from the danger
The reflex arc passes at the level of the spinal cord and the signals involved in reflexaction do not travel up to the brain This is important because sending signals to the brain would involve more time . Althoug every action is ultimately controlled by the brain, the reflex action is mainly controlled at the level of spinal cord.