Stimulation of Myofibrils present in the Muscle causes contraction.
A muscle contraction occurs when the Action Potential travels along the nerves thereby leading to contraction.
The action potential generated at the muscle occurs due to the release of Acetylcholine through the motor neuron. Calcium ions from the sarcoplasmic reticulum of the muscle are released on detection of action potential leading to the further events of muscle contraction by shortening of the length of the sarcomeres running along the length of the myofibrils.
Learn more about Sarcomere here, https://brainly.com/question/6908670
#SPJ4
