Question

The reflex arcs in which one or more interneurons connect the afferent and efferent signals are…....
A. Autonomic reflex
B. Somatic reflex
C. Monosynaptic reflex
D. Polysynaptic reflex

Answer 1

Hint: Reflexes, or reflex actions, are involuntary or instantaneous movements in response to a specific stimulus. A neural pathway that controls a reflex action is known as a reflex arc.
There are two types of reflex arcs. They are- autonomic reflex arc (affecting inner organs) and somatic reflex arc (affecting muscles).

Complete answer: Autonomic reflexes are unconscious motor reflexes relayed from the organs and glands to the central nervous system through visceral afferent signaling.
1. Somatic reflexes involve specialized sensory receptors called proprioceptors that monitor the position of our limbs in space, body movement, and the amount of strain on our musculoskeletal system.
2. The effectors involved in somatic reflexes are located within skeletal muscle.
3. A monosynaptic reflex, such as the knee jerk reflex, is a simple reflex involving only one synapse between the sensory and motor neuron.
4. Polysynaptic reflex is a reflex action that involves an electrical impulse being transferred from a sensory neuron (afferent) to a motor neuron (efferent) via at least one connecting neuron (interneuron) in the spinal cord. Most simple reflexes are polysynaptic, allowing processing or inhibition of polysynaptic reflexes within the brain.

So, the correct answer is “Option D”.

Note: A neuron located in the central nervous system that projects its axon outside the central nervous system and directly or indirectly controls muscles are known as motor neurons.
The neurons responsible for converting various external stimuli that come from the environment into corresponding internal stimuli are known as sensory neurons.