What happens in the path of a reflex action?

In a reflex action, a sensory neuron detects a stimulus and sends an impulse to the spinal cord. The signal is then processed by interneurons, which relay the impulse to a motor neuron. This motor neuron transmits the signal to the appropriate muscle, causing it to contract and respond quickly, often before the brain is aware of the stimulus. This rapid response helps protect the body from harm.