Question

If a motor neuron involved in a reflex arc is damaged, which event in that arc is least likely to occur?

Answer 1

If a motor neuron involved in a reflex arc is damaged, the event that is least likely to occur is the muscle contraction in response to the sensory stimulus.

Step-by-step explanation:

If a motor neuron involved in a reflex arc is damaged, the event that is least likely to occur is the muscle contraction in response to the sensory stimulus. In a reflex arc, the motor neuron carries the impulse from the interneuron to the muscle, causing it to contract. If the motor neuron is damaged, this communication pathway is disrupted, and the muscle will not receive the signal to contract.

Answer 2

Step-by-step explanation:

The path of reflex arc is as following

Receptor > Sensory neuron (afferent) > Interneuron > Motor neuron (efferent) > Effector organ (muscle or glands).

When our motor neuron is impaired, the impulses are sent, but if our motor neuron is damaged, we can not get input through the sensory neuron and the interneuron.