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A colorful cartoon neuron sends an electrical signal into a muscle fiber's T-tubule, surrounded by the Sarcoplasmic Reticulum.

A colorful cartoon neuron sends an electrical signal into a muscle fiber's T-tubule, surrounded by the Sarcoplasmic Reticulum.

Scene: A cartoon neuron sending an electrical signal to a muscle cell. Caption: ā€œAn electrical signal travels down the T-tubule deep into the muscle fiber.ā€ Visual cues: Show a ā€œT-Tubuleā€ labeled as a blue tube running into the muscle. The signal (like a lightning bolt ⚔) travels through it. Sarcoplasmic Reticulum (SR) shown surrounding the T-tubule. Ver mais