Question

The simplest reflex arc, containing only a primary afferent and an effector neuron, is sometimes referred to as?

1) monosynaptic
2) bineural
3) convergent
4) voluntary

Answer 1

The simplest reflex arc, containing only a primary afferent and an effector neuron, is sometimes referred to as:

1) monosynaptic

Step-by-step explanation:

The simplest reflex arc, containing only a primary afferent and an effector neuron, is referred to as monosynaptic. This term highlights the presence of a single synapse in this neural pathway.

In a monosynaptic reflex arc, the sensory neuron directly communicates with the motor neuron through a single synapse in the spinal cord. The sensory neuron carries information from a sensory receptor to the spinal cord, where it synapses with the motor neuron, leading to a rapid and automatic motor response. This direct communication, with only one synapse involved, is characteristic of monosynaptic reflex arcs.

Unlike more complex reflex arcs involving interneurons, the monosynaptic reflex arc enables a quicker response to a stimulus. The absence of additional processing in the spinal cord reduces the time between sensory input and motor output, making it an efficient and rapid neural circuit. This simplicity and speed are advantageous in situations where a quick and automatic response is crucial for the organism's survival or well-being.