Peter Attia· MD
what happens is you've got two of these microfilaments called actin and myosin all right now what happens is they're overlap so they're not touching each other and you've got mein um kind of laying in the middle and it's this big thick tube and it's got these heads that flick off the top of it all right now these heads reach up and they extend again in 3D but if just think about 2D they reach up and grab on what's called actin all right and so the idea when you contract the muscle is the myosin will reach up and they're going to reach out sort of outward if you will and my hands would then grab onto the actin and then if I I were to squeeze my hands and bring my hands closer to my face that's the myosin is actually then pulling the actin closer together