What makes muscles contract? A physiologist explains how muscles move

A lot goes into making sure your muscles can move your body. (Image source: Rawpixel/Public domain.)

What makes muscles contract? A physiologist explains how muscles move

As part of The Conversations’ “Curious Kids” series, USC Dornsife’s Kiki Crawford describes how an entire team of electricity, calcium, energy and proteins all work together to move your muscles.

ByKiki Crawford July 27, 2026

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Muscles are amazing. They’re what let you strum a guitar, kick a soccer ball and high-five your friends. When you decide to move, your brain tells your muscles what to do, and they spring into action. But what is actually happening inside your muscles to make that happen?

To answer that question, you first need to understand how your muscles are put together.

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