Knife break

Receptor (tendon spindle in tendon)-afferent nerve-central (spinal cord)-efferent nerve-effector (muscle) When the tension of the stretched muscle is too large and exceeds a certain limit, it will cause the opposite reaction, not the muscle The tension is further strengthened but the whole muscle suddenly relaxes. This is called an elongation response. This reaction process is similar to the resistance of a spring-loaded folding knife to a folding knife, so it is also called a folding knife reaction.