College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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Which type of reflex arc consists of one sensory neuron and one motor neuron?

Polysynaptic Reflex
Monosynaptic Reflex
Crossed-Extensor Reflex
Flexor Withdrawal Reflex

The correct answer is: Monosynaptic Reflex

A monosynaptic reflex arc is characterized by its simplicity, consisting of only one sensory neuron and one motor neuron. In this type of reflex, the sensory neuron directly synapses with the motor neuron in the spinal cord, allowing for a quick response to stimuli. This example can be commonly seen in the knee-jerk reaction, where tapping the patellar tendon elicits a rapid contraction of the quadriceps muscle. Polysynaptic reflex arcs, on the other hand, involve one or more interneurons in addition to the sensory and motor neurons, allowing for more complex reflex responses. The crossed-extensor reflex and flexor withdrawal reflex also involve multiple neurons, including additional pathways for coordinating responses between limbs, which makes them more complicated than a monosynaptic reflex.