Question

A simple spinal reflex goes along which of the following reflex arcs?

1) effector, afferent neuron, integration center, efferent neuron, receptor
2) receptor, afferent neuron, integration center, efferent neuron, effector
3) effector, efferent neuron, integration center, afferent neuron, receptor
4) receptor, efferent neuron, integration center, afferent neuron, effector

Answer 1

The correct order of a simple spinal reflex arc is: receptor, afferent neuron, integration center, efferent neuron, effector, aligning with option (2).

Step-by-step explanation:

The correct order of a simple spinal reflex arc is: receptor, afferent neuron, integration center, efferent neuron, effector. Therefore, the correct answer is (2) receptor, afferent neuron, integration center, efferent neuron, effector.

In a spinal reflex, the process begins when a sensory receptor detects a stimulus. This information is then carried toward the central nervous system by an afferent neuron. At the integration center, typically within the spinal cord, an interneuron processes the sensory information and relays it to an efferent neuron.

The efferent neuron carries the signal away from the central nervous system to an effector, which is typically a muscle or gland that responds to the initial stimulus.

Therefore, the correct answer is (2) receptor, afferent neuron, integration center, efferent neuron, effector.