2nd October 2019


Why do we have a knee jerk reflex?

Now let's follow the path of the knee jerk reflex to see how it works. The tendon below your kneecap connects to the quadriceps muscle on top of your thigh. The hammer's rap on the tendon slightly stretches the muscle. Sensory nerves in the muscle are stimulated by the stretching and send an impulse to the spinal cord.
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