Question

Which of the following occurs in simple reflex arc?

• A. The sensory neuron synapses directly with the motor neuron
• B. Sensory and motor neurons can synapse outside of the spinal cord
• C. Sensory neurons synapse in the brain
• D. The motor response occurs without synaptic delay
• E. A minimum of three neurons must participate

Answer 1

The correct option is A The sensory neuron synapses directly with the motor neuron

• A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.
• This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. Hence, The sensory neuron synapses directly with the motor neuron in a simple reflex arc.

So, the correct answer is 'The sensory neuron synapses directly with the motor neuron'.