The structure enabling depolarization to travel deep into the muscle fiber is the ______.

Question

Quizplus · Accepted Answer

The T tubule is a structure that enables depolarization to travel deep into the muscle fiber. It is a small, invaginated membrane that runs perpendicular to the sarcolemma. When an action potential reaches the sarcolemma, it causes the T tubule to depolarize, which in turn causes the sarcoplasmic reticulum to release calcium ions. These calcium ions bind to receptors on the myofilaments, causing them to slide past each other and generate force.

The Structure Enabling Depolarization to Travel Deep into the Muscle