What is a reflex action ?

Explanation

Reflex action is an immediate, unconscious, involuntary response of effectors to a stimulus without the involvement of the brain. (The information will simultaneously be transmitted to the brain for further action).
Example, on touching a hot object (stimulus), we immediately remove our hand from it.
Other examples are watering of mouth on seeing food, sneezing, blinking of eyes and yawning.
Reflex Arc: The pathway of reflex action is termed as reflex arc. As a response to a strong stimuli, sensory nerves transmit the information to the spinal cord. The relay neurons in the spinal cord receives the messages from the sensory nerves and transmits the messages to the motor nerves. These motor nerves carry the messages to the muscles or glands and the effector organs responds quickly to avert any major damage to the tissues.