Question

Sort the following in the order in which messages travel in a reflex arc.

• A. Receptor
• B. Sensory neuron
• C. Relay neuron
• D. Motor neuron
• E. Effector

Answer 1

In a reflex arc, the receptors collect information and send it to the spinal cord through sensory neurons. The relay neurons present in the spinal cord conveys the instantaneous decision to the motor neuron. The motor neurons pass on the message to the effector muscles for execution of the instruction. A delayed message is also sent to the brain.