When a doctor or nurse uses a hammer to hit a joint, like a knee, what actually causes the leg to kick? Are patients supposed to make the motion to kick when they feel the knock? Or does the hammer knock onto a nerve, that spasms the muscles into a kick?
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…really? Come on mate.
>In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain. The reflex is then an automatic response to a stimulus that does not receive or need conscious thought.
https://en.wikipedia.org/wiki/Reflex
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