what is Reflex action ?

Reflex action is an automatic, quick and involuntary action in the body brought about by a stimulus.

Characteristics of reflex actions:

1. Rapid automatic responses to a stimulus without the conscious involvement of the brain

2. Controlled by spinal cord

3. Very quick and instantaneous

4. May involve any muscle or a gland 

5. Can be conditioned

Some examples of reflex actions:

1. Shivering when it is too cold or sweating when it is too hot.

2. Non-stop beating of the heart.

3. Instant withdrawal of the hand when it accidently touches a hot iron.

4. Dilation of the pupil in eyes when looking in the dark.