How does the reflex beneath the knee cap make your leg “swing” when you hit it?

Question

How does the reflex beneath the knee cap make your leg “swing” when you hit it?

In: 136

Answer 1

Your muscles have sensors that tell your brain where the muscle is and how flexed it is. Your tight muscle ends a bit under your knee cap. Hitting the tendon with a hammer stretches your muscle and your body has a reflex to keep the balance – which is why your muscle contracts.