It depolarizes once it receives the signal from the nervous system. And by depolarizing, it basically creates this kind of peak in our action potential. So it generates this action potential. So we have depolarization, then we have repolarization and we have hyperpolarization. And only then does our muscle contraction actually begin to take place. So with respect to our red curve, with respect to the muscle contraction, this section is known as the late 10th period because this is when our action potential is actually taking place.