Question

Define reflex arc.

Answer 1

Reflex Arc:

• The reflex arc is a pathway of transporting a stimulus from receptor to effector organs to create a reflex action.
• The receptors first receive the stimulus.
• These receptors pass on the stimulus to the sensory neurons, which transmit the stimulus to the spinal cord (central nervous system).
• The spinal cord processes the stimulus and passes it to the motor neurons.
• The motor neurons then carry the processed stimulus to the effector organs to create a reflex action.

Therefore, the pathway of a reflex arc can be represented as:

$\mathrm{Receptors}\to \mathrm{Sensory}\mathrm{neurons}\to \mathrm{Spinal}\mathrm{cord}\to \mathrm{Motor}\mathrm{neurons}\to \mathrm{Effector}\mathrm{organs}$