What is reflex action?

A reflex action is a rapid, automatic response to a stimulus controlled by the spinal cord no conscious brain processing needed.

Reflex arc: Receptor → Sensory neuron → Spinal cord → Motor neuron → Effector

Example: Pulling hand from hot object before feeling pain. Brain receives information after the reflex occurs.

A reflex action is an involuntary, instant response controlled by the spinal cord through a reflex arc, bypassing conscious brain processing.