The usual flow of information in a reflex arc is
A) cranial nerve, connector neuron, spinal nerve
B) sensory neuron, connector neuron, motor neuron
C) effector cell, interneuron, connector neuron
D) sensory neuron, motor neuron, reflex neuron

Question

Quizplus · Accepted Answer

The usual flow of information in a reflex arc is from the sensory neuron, which detects a stimulus and sends information to the connector neuron (also known as the interneuron) in the spinal cord. The connector neuron processes the information and then sends a signal to the motor neuron, which activates the effector cell (e.g. muscle or gland) to respond accordingly. Therefore, the correct flow of information in a reflex arc is sensory neuron, connector neuron, and motor neuron, making option B the correct choice. Option A is incorrect because cranial nerves are not typically involved in reflex arcs, and option D is incorrect because there is no such thing as a "reflex neuron." Option C is incorrect because effector cells do not send signals in a reflex arc.

The Usual Flow of Information in a Reflex Arc Is