الفعل المنعكس.

The video explains reflex actions as automatic, involuntary responses to sudden external stimuli, aimed at protecting the body from harm. It uses the example of withdrawing a hand from a hot object to illustrate this concept. The process involves nerve impulses traveling directly to the affected organ via sensory and motor nerves, bypassing the brain, with the spinal cord playing a crucial role. The video details how thermal stimuli are received, and nerve impulses are transmitted to cause muscle contraction, resulting in the hand being pulled away from the heat.

What new insight or understanding did you gain from this video?