All reflexes are involuntary. Only polysynaptic reflex arcs use afferent and efferent nerve fibers. Monosynaptic reflex pathways do not use interneurons. The purpose of all reflexes is to prevent injury. A reflex is a rapid,involuntary sequence of actions that occur in response to a specific stimulus.In polysynaptic reflex arcs,one or more interneurons connect afferent (sensory) and efferent (motor) signals.When a reflex arc consists of only two neurons,one sensory neuron,and one motor neuron,it is defined as monosynaptic.Monosynaptic refers to the presence of a single chemical synapse.A monosynaptic reflex has only one synapse in its reflex arc,there are no interneurons. Solution All reflexes are involuntary. Only polysynaptic reflex arcs use afferent and efferent nerve fibers. Monosynaptic reflex pathways do not use interneurons. The purpose of all reflexes is to prevent injury. A reflex is a rapid,involuntary sequence of actions that occur in response to a specific stimulus.In polysynaptic reflex arcs,one or more interneurons connect afferent (sensory) and efferent (motor) signals.When a reflex arc consists of only two neurons,one sensory neuron,and one motor neuron,it is defined as monosynaptic.Monosynaptic refers to the presence of a single chemical synapse.A monosynaptic reflex has only one synapse in its reflex arc,there are no interneurons..