Question

define reflex action and reflex arc​

Answer 1

REFLEX ACTION

• Reflex Action is defined as a spontaneous response to any harmful stimulus.
• Reflex Action has survival value.
• Reflex Action is controlled by the CNS, the spinal cord to be more precise.
• Response is initiated by exploiting past experiences stored in memory cells of CNS.

For example,

When our hand comes in contact with a hot object, hand is removed as soon as possible when before pain is perceived.

Reflex Arc

Path taken by the reflex action is known as Reflex Arc.

• Receptor Organs
• Sensory Neurones
• Spinal Cord
• Motor Neurones
• Effector Organs (Muscles)