Muscle Contraction Mechanism Explained

Your muscles are full of tiny molecular machines playing a constant game of tug-of-war to

make you move. Inside each muscle cell, you have thick filaments called myosin and

thin filaments called actin. Normally, a protein blocks them from connecting.

But when your brain sends a signal, it triggers a massive calcium release inside the cell.

This calcium is the key! It moves the blocker protein out of the way.

Now, the myosin heads can grab onto actin, pull, and then release,

using ATP for energy. This is the power stroke. This tiny sliding action,

happening millions of times, is what generates force and makes your entire muscle