what does this trigger?

Question

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Answer 1

The "stretch reflex", causing the muscle motor unit to fire, in turn causing contraction of the stretched muscle

Answer 2

Identify the Trigger

When a muscle is stretched, it triggers a response in the nervous system.

Activation of the Stretch Reflex

This stretching activates the "stretch reflex," which is an automatic response to muscle stretch.

Firing of the Muscle Motor Unit

The stretch reflex causes the muscle motor unit to fire, meaning the nerve and muscle fibers connected to it activate.

Muscle Contraction
The firing of the muscle motor unit leads to the contraction of the stretched muscle, helping to resist the stretching force.