Question

Describe the path of reflex arc. What is its importance?

Answer 1

The pathway followed during a reflex action is:

Stimulus → Receptor → Sensory (Afferent) Neuron → Spinal Cord (Relay Neuron) → Motor (Efferent) Neuron → Effector (Muscle/Gland) → Response

• Receptor: It detects the stimulus such as heat or pain.
• Sensory Neuron: It triggers and transmits the electrical impulse from the receptor towards the spinal cord.
• Relay Neuron in Spinal Cord: It acts as an interneuron in the spinal cord, passing the incoming impulse to a motor neuron.
• Motor Neuron: It transmits the response impulse from the spinal cord to the designated effector organ.
• Effector: It is the responsive muscle or gland, for example, arm muscles contracting to pull a hand away.

Importance of Reflex Arc:

1. Rapid Response: It enables instantaneous and automatic reactions without requiring prior conscious thought or calculation by the brain.
2. Protective Function: It serves as a self-protective mechanism, instantly shielding the body from acute damage or serious injury.