Question

Arrange the path taken by an impulse in a reflex arc.

• A. Spinal cord
• B. Sensory neuron
• C. Effector muscle
• D. Motor neuron

Answer 1

A reflex action starts with a stimulus. Receptors in the sensory neurons present in the sense organs detect them.
Sensory neuron sends electrical impulses to adjacent neurons and finally to neurons located in the spinal cord of the CNS. These neurons connect sensory neurons to motor neurons.
Motor neuron sends electrical impulses to an effector.
Effector produces a response (muscle contracts to move the hand away).