Question

The reflex arc which is made of two neurons is known as

• A. Monosynaptic reflex arc
• B. Disynaptic arc
• C. Polysynaptic reflex arc
• D. Asynaptic reflex arc

Answer 1

The correct option is A Monosynaptic reflex arc

Depending upon the number of synapses, reflexes are categorized as monosynaptic, disynaptic and polysynaptic ones. The reflex arc with single synapse and therefore only two neurons (afferent and efferent neurons) is called as monosynaptic. For examples, stretch reflexes. This makes option A correct.

Disynaptic arch have one interneuron located between afferent and efferent neurons of reflex arc i.e., they have two synapses and three neurons which make option B incorrect. For examples, inverse stretch arc.

Polysynaptic reflexes are characterized by the presence of more than one interneurons between afferent and efferent neurons of reflex arc i.e., more than three neurons which make option C incorrect. For example, cross flexor reflex, withdrawal reflex etc.

Option D is incorrect as reflex arc has at least one synapse and two neurons.

Therefore, the correct answer is option A.