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A reflex arc is a neural pathway that controls a reflex action. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.his 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 reflex is carried out. Analysis of the signal takes place after action has been taken.
Best Answer: When something's a reflex, it means that it happens quickly, without thought. When a reflex arc is activated, an impulse travels only to the spinal cord, not to the brain, and then back out again to the motor neurons and the muscles.A reflex can mean the difference between life and death.For example, when a doctor taps your knee with that little hammer doohickey, he/she is checking for a reflex which is the remnant of ancient humans' life in the wild. reflex can mean the difference between life and death. For example, when a doctor taps your knee with that little hammer doohickey, he/she is checking for a reflex which is the remnant of ancient humans' life in the wild.